A handful of famous negligence cases built the framework courts still use to decide who owes a duty of care, how far that duty stretches, what counts as proof of a mistake, and when a defendant should pay more than simple compensation. A decomposed snail in a bottle of ginger beer, a collapsing wooden wheel on a new Buick, an exploding package on a railway platform, a scalding cup of drive-through coffee, and a therapist who stayed silent about a patient’s threat each produced a rule that lawyers, judges, and juries apply every day.
The Four Elements Behind Every Case Below
Each of these decisions turned on one of the same four building blocks a plaintiff has to prove in any negligence claim. Courts treat them as a chain: break one link and the entire claim fails.
- Duty. The defendant owed the plaintiff an obligation to act with reasonable care under the circumstances.
- Breach. The defendant fell short of that standard by doing something a reasonably careful person would not have done.
- Causation. The breach actually caused the harm. Courts apply a “but-for” test (would the injury have happened without the defendant’s conduct?) and a proximate cause test (was the harm a foreseeable consequence, not a bizarre coincidence?).
- Damages. The plaintiff suffered real, measurable harm.
Keep these in mind as you read. The cases below became famous precisely because they answered a hard question about one of them.
Donoghue v Stevenson (1932): The Neighbor Principle
Modern negligence law traces back to a café in Paisley, Scotland. A woman’s friend bought her a bottle of ginger beer. After she drank some, the friend poured out the rest and a decomposed snail floated out of the opaque bottle. She alleged shock and severe gastroenteritis.1Scottish Law Reports. Donoghue v Stevenson Case Report
Her problem was that she had no contract with the manufacturer. Her friend bought the drink from the café, and the café bought from the bottler. The prevailing view was that without a direct purchase, the manufacturer owed her nothing.
The House of Lords disagreed and reshaped negligence law. The court set out what became known as the neighbor principle: you owe a duty of care to anyone closely and directly affected by your actions, provided you should have reasonably had them in mind when acting. For manufacturers, that meant a legal obligation to ensure product safety for the end consumer, not just the retailer.1Scottish Law Reports. Donoghue v Stevenson Case Report The decision cut negligence loose from contract law. Nearly a century later, every product liability claim in the common-law world rests on this foundation.
MacPherson v Buick Motor Co. (1916): The End of the Privity Defense in America
Sixteen years before the ginger beer case reached the House of Lords, a New York court reached a similar conclusion. A man bought a Buick from a retail dealer. While he was driving, one of the wooden wheels crumbled and collapsed, throwing him from the car. Buick had not made the wheel; it had bought it from a parts supplier and never inspected it.2New York State Unified Court System. MacPherson v Buick
Buick argued it owed the driver no duty because his contract was with the dealer, not the automaker. Judge Benjamin Cardozo, writing for the New York Court of Appeals, rejected the defense. When a product is reasonably certain to endanger life if negligently made, the manufacturer owes a duty of care to anyone who will foreseeably use it, whatever the chain of sale.2New York State Unified Court System. MacPherson v Buick
Cardozo also held that Buick could not shift blame to the wheel supplier. As the maker of the finished automobile, Buick was responsible for inspecting components before putting the car on the market. The rule made manufacturers accountable for the quality of every part in their products, including those from outside vendors.
Palsgraf v Long Island Railroad (1928): How Far Does Duty Reach?
Duty has to stop somewhere, and this case drew the line. At a Long Island Railroad station, two men ran to board a moving train. One made it aboard. The second, carrying a small newspaper-wrapped package, stumbled as he jumped on. A guard on the train pulled him up while another on the platform pushed from behind. The package slipped, fell to the rails, and exploded. It contained fireworks, though nothing about its appearance suggested anything dangerous.3New York State Unified Court System. Palsgraf v Long Island Railroad Co
The shock of the blast knocked over a set of heavy scales at the far end of the platform. The scales struck Helen Palsgraf, injuring her. She sued the railroad for the carelessness of its guards.
Chief Judge Cardozo, now on New York’s highest court, ruled against her. Even if the guards were careless toward the man with the package, they had no reason to think their actions posed any risk to a bystander standing many feet away. They could not have foreseen an explosion, let alone one that would topple equipment at the opposite end of the platform. Without a foreseeable risk to Palsgraf personally, the railroad owed her no duty at all.3New York State Unified Court System. Palsgraf v Long Island Railroad Co
Judge Andrews dissented with a competing theory that remains influential. He argued that everyone owes the world a general duty to avoid unreasonably dangerous conduct, and that when someone breaches it, the real question is proximate cause: how far along the chain of consequences should responsibility run? Courts today still split along these two approaches, and Palsgraf is taught in nearly every first-year tort class.3New York State Unified Court System. Palsgraf v Long Island Railroad Co
Escola v Coca-Cola Bottling Co. (1944): When the Thing Speaks for Itself
Sometimes a plaintiff knows something went wrong but cannot point to the exact step where the defendant made the mistake. A waitress in a California restaurant was stacking bottles of Coca-Cola in a refrigerator when one exploded in her hand, causing serious injuries. She had no way to show what specific error in the bottling process left the bottle dangerously over-pressurized. She relied on the doctrine of res ipsa loquitur, Latin for “the thing speaks for itself.”4Justia. Escola v Coca Cola Bottling Co
The California Supreme Court held that the doctrine applies when two conditions are met: the defendant had exclusive control over the thing that caused the injury, and the accident is the kind that ordinarily does not happen without negligence.4Justia. Escola v Coca Cola Bottling Co Sealed glass bottles do not spontaneously explode under normal conditions. Because the bottler had sole control over filling and sealing, the jury could reasonably infer negligence without the plaintiff pinpointing the exact failure.
Justice Roger Traynor’s concurrence may have had the longer-lasting effect. Traynor argued that negligence theory was not enough. Manufacturers, he wrote, should bear absolute liability for defective products placed on the market, whether or not a plaintiff can prove carelessness. They are best positioned to prevent defects, best able to absorb the cost through insurance, and best placed to spread that cost across all consumers.5Supreme Court of California. Escola v Coca Cola Bottling Co Two decades later, Traynor’s concurrence became the foundation for modern strict product liability law.
Liebeck v McDonald’s (1992): Comparative Fault and Punitive Damages
No negligence case has been more misunderstood by the public. In 1992, a 79-year-old woman named Stella Liebeck bought a cup of coffee from a McDonald’s drive-through in Albuquerque, New Mexico. Her grandson was driving. After they parked, she placed the cup between her knees and lifted the lid to add cream and sugar. The coffee spilled onto her lap and caused third-degree burns over 16 percent of her body, including the skin of her inner thighs and groin. She spent eight days in the hospital and underwent painful skin grafts.
The injuries were that severe because McDonald’s served its coffee at 180 to 190 degrees Fahrenheit, hot enough to cause full-thickness burns in under three seconds. Internal documents showed the company had received more than 700 reports of coffee burns over the prior decade, including injuries to children, and had not lowered the serving temperature. Liebeck initially asked McDonald’s for $20,000 to cover her medical bills. The company offered $800.
At trial in 1994, the jury awarded $200,000 in compensatory damages and $2.7 million in punitive damages. The punitive figure represented roughly two days of McDonald’s coffee revenue nationwide, chosen to send a financial message the company would actually feel. Two reductions followed. The jury found Liebeck 20 percent at fault for spilling the coffee, cutting her compensatory award to $160,000. The trial judge then independently reduced the punitive damages to $480,000, calling McDonald’s behavior “willful, wanton, and reckless” but finding the original amount excessive. The parties reached a confidential settlement before an appeal was decided.
The case illustrates two distinct principles. Comparative fault lets a jury assign a percentage of blame to the plaintiff and reduce the award accordingly, rather than barring recovery entirely. Punitive damages serve a different purpose: they punish conduct that goes beyond ordinary carelessness into reckless disregard for safety. The 700 documented burn complaints, combined with McDonald’s refusal to change its practices, crossed that threshold in the jury’s eyes.
Tarasoff v Regents of the University of California (1976): The Duty to Warn
Most negligence cases involve accidental harm. This one involved a therapist’s failure to act on a patient’s stated intention to kill. In 1969, a graduate student named Prosenjit Poddar told his psychologist at a university counseling center that he intended to kill a young woman. The therapist notified campus police, who briefly detained Poddar and released him when he appeared rational. No one warned the intended victim or her family. Two months later, Poddar killed Tatiana Tarasoff.6Justia. Tarasoff v Regents of University of California
Tarasoff’s parents sued the university, the therapists, and the campus police. The California Supreme Court ruled that when a therapist determines, or should determine under professional standards, that a patient poses a serious danger of violence to another person, the therapist has an obligation to use reasonable care to protect the intended victim. That might mean warning the person directly, alerting family members, notifying police, or taking whatever other steps the circumstances reasonably require.6Justia. Tarasoff v Regents of University of California
The court acknowledged that this duty collides with patient confidentiality. Its answer was blunt: the privilege of confidential communication ends where public safety begins.6Justia. Tarasoff v Regents of University of California
Tarasoff was a California decision, but its influence spread. A majority of states now impose either a mandatory duty to protect or a permissive duty that shields therapists from liability if they choose to warn. A small number of states have declined to adopt any version of the rule. Across most of the country, mental health professionals must balance patient privacy against the safety of identifiable potential victims, and when those interests collide, safety wins.
Anderson v Cryovac: Proving Causation in Environmental Cases
The cases above involve a fairly clear line between one party’s conduct and another party’s injury. Environmental contamination introduces a messier problem: how do you prove that specific chemicals from a specific company caused illnesses that may not appear for years?
In the late 1970s, public health officials discovered that two municipal drinking water wells in Woburn, Massachusetts were contaminated with toxic industrial solvents, including trichloroethylene. Families in the surrounding neighborhood had experienced a troubling cluster of leukemia cases, particularly among children. In 1982, those families sued W.R. Grace and Beatrice Foods, alleging that chemicals from the companies’ local operations had seeped into the groundwater and poisoned the wells.7Justia. Anderson v Cryovac Inc
The litigation was grueling. Plaintiffs needed scientific testimony and geological surveys to trace how chemicals migrated through soil and rock over years. They had to show not just that contamination existed, but that specific pollutants from specific defendants reached specific wells and caused specific diseases in specific people. The jury found W.R. Grace liable for contaminating the wells and cleared Beatrice Foods. Grace ultimately settled for $8 million before the judge ruled on remaining issues. A separate, smaller defendant had earlier settled for just over $1 million.
Later chronicled in the book and film “A Civil Action,” the Woburn case exposed how difficult environmental negligence claims are for ordinary plaintiffs. The families had to fund years of complex scientific investigation against corporations with vastly greater resources, and even a favorable verdict produced a settlement modest relative to the scope of the harm. The case became a reference point for the challenge of proving causation when the gap between exposure and illness spans years, the science is contested, and multiple potential sources of contamination exist.