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.
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?
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.
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.
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.
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.
Watson v. Kentucky & Indiana Bridge & R. Co. crystallizes the proximate cause analysis around foreseeability and the nature of intervening acts. It teaches that when a defendant negligently creates a volatile hazard, accidental or negligent human behavior that ignites the danger is often part of the risk the defendant must anticipate, while intentional or malicious acts are ordinarily outside that risk and supersede liability. For law students, Watson remains a touchstone for structuring causation essays: classify the intervening conduct, analyze foreseeability and scope of risk, and recognize the jury's primacy where facts are contested. The case's reasoning continues to inform modern doctrine across negligence, premises liability, and products cases involving third-party acts.