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The way this question was phrased made me think of res ipsa loquitur, which means "The thing speaks for itself". The common case to teach it in torts classes is an old English case called Byrne v. Boadle. In it, a flour barrel somehow fell out of a window, rolled down the street, and hit Byrne. We have no idea HOW Boadle was so negligent that a flour barrel fell out of a window, but the flour barrel rolling down the street clearly proves that they did something really careless.