What are the facts?
The defendant railroad and bridge company, in the course of switching operations, negligently caused a tank car containing gasoline to derail/overturn and spill a large quantity of the highly volatile fuel onto a public street and into nearby gutters. Gasoline vapors spread through the area, drawing a crowd of onlookers, including the plaintiff, Watson. Shortly thereafter, an explosion occurred, severely injuring Watson. Evidence suggested the ignition source was a match struck by a bystander; but the circumstances were disputed. One view was that the bystander innocently or negligently lit a match for an ordinary purpose (e.g., lighting a cigar), which inadvertently ignited the gasoline vapors. Another view was that the match was struck and applied to the gasoline intentionally and maliciously. The trial court took the case away from the jury (by peremptory instruction/directed verdict) and entered judgment for the defendant on the theory that the match-striker's act was the proximate cause. Watson appealed.
What is the legal issue?
When a defendant's negligence creates a dangerous condition (spilled gasoline and vapors), does a third party's act of striking a match constitute a superseding cause that relieves the defendant of liability—and does the answer turn on whether the intervening act was accidental/negligent versus intentional/malicious?
What rule applies?
A negligent actor remains liable where the general type of harm results from the foreseeable operation of the risk he created, including ignition by ordinary, accidental, or negligent acts of third persons that are reasonably to be anticipated. However, an intentional, malicious, or criminal intervening act ordinarily constitutes a superseding cause that breaks the chain of proximate causation, unless such intentional conduct itself was reasonably foreseeable. Determining whether the intervening act was of a foreseeable accidental/negligent type or an unforeseeable intentional/malicious type is a question for the jury when the evidence permits either inference.
What did the court hold?
Reversed and remanded. It was error to direct a verdict for the defendant. If the ignition was caused by an accidental or negligent act (e.g., lighting a cigar), the defendant's negligence could be the proximate cause and liability could attach; if caused by an intentional or malicious act, that act would be a superseding cause cutting off liability. The nature of the intervening act was a jury question.
What is the reasoning?
The court emphasized the volatile nature of gasoline and the obvious foreseeability that, once gasoline is spilled and its vapors permeate a public street, any ordinary spark or flame—such as from a match used for a commonplace purpose—might ignite it. When a defendant's negligence creates a condition that naturally invites such ordinary, accidental interactions, the resultant harm is within the scope of risks the defendant should have anticipated. Thus, accidental or negligent ignition does not supersede the defendant's negligence. At the same time, public policy has historically treated intentional or malicious acts by third persons as outside the scope of risks that a negligent actor is generally expected to anticipate in the absence of special circumstances. An intentional act is an independent, responsible agency that typically breaks the causal chain. The court therefore drew a categorical distinction: negligent/accidental intervenors are often part of the risk, while intentional/malicious intervenors are ordinarily superseding. The procedural posture was critical. The evidence could support either inference regarding the match-striker's mental state. Because reasonable jurors could find either accidental/negligent or intentional/malicious ignition based on the record, it was improper for the trial court to remove the issue from the jury. The question of the character of the intervening act—and thus whether the original negligence was a proximate cause—had to be submitted to the trier of fact.
Why is this case significant?
Watson is a foundational authority on proximate cause and intervening/superseding causation. It operationalizes foreseeability by treating ordinary accidental ignitions as within the scope of risk created by spilling gasoline, while presuming intentional or malicious acts to be superseding unless specially foreseeable. The case also highlights the jury's role in resolving disputed facts central to proximate cause and cautions against premature judicial resolution via directed verdict. Modern formulations (including Restatement approaches) still reflect Watson's central insight: liability turns on whether the harm that occurred was among the risks that made the conduct negligent, and the character of intervening acts matters to that assessment.
Does an intentional criminal act by a third party always break the chain of causation?
Not always, but ordinarily it does. Under Watson, intentional or malicious acts are typically superseding causes that cut off liability. However, if such acts are themselves reasonably foreseeable—because, for example, the defendant's conduct created a situation in which intentional wrongdoing was a highly probable response—courts may treat them as within the scope of risk. Modern doctrine frames this as a foreseeability or scope-of-risk inquiry rather than an absolute rule.
Why was it improper for the trial court to direct a verdict for the defendant?
Because the evidence permitted competing inferences about the intervening act's character. If the ignition was accidental or merely negligent (e.g., lighting a cigar), a jury could find that the defendant's negligence remained a proximate cause. If it was intentional or malicious, the jury could find the act superseding. Deciding between those inferences is a fact question reserved for the jury when the record supports both.
How does Watson's rule relate to modern Restatement approaches to proximate cause?
Watson's distinction aligns with the Restatement (Second) and (Third) focus on foreseeability and scope of liability. The Restatement (Third) asks whether the harm was among the risks that made the conduct tortious. Accidental or negligent ignitions are commonly within that risk when gasoline is spilled; intentional ignitions generally are not, unless intentionally wrongful conduct was itself within the scope of the foreseeable risk created by the defendant.
What practical exam tip does Watson offer for intervening cause problems?
Identify the type of intervenor (accidental/negligent vs. intentional/malicious), tie that categorization to foreseeability and the scope of risks created by the defendant, and assess whether the facts make this a jury question. Explicitly discuss whether ordinary human behavior is a normal incident of the risk (no superseding cause) versus independent, purposeful wrongdoing (likely superseding cause).
Is lighting a match always a superseding cause in gasoline-spill cases?
No. Lighting a match for an ordinary purpose is a paradigmatic accidental or negligent act that is foreseeable in the presence of gasoline vapors. Under Watson, such an act would not supersede the original negligence. Only when the match is used intentionally or maliciously to ignite the vapors does it typically qualify as a superseding cause.
What is the broader policy rationale behind Watson's distinction?
The law generally expects actors to anticipate ordinary, accidental interactions with hazards they create (because such interactions are part of everyday life), but it does not ordinarily require anticipating deliberate wrongdoing by third parties. This allocation reflects both fairness (limiting liability to risks that make conduct wrongful) and administrability (preserving jury roles and avoiding boundless liability).