Let me tell you a story. One day, a teenage boy went to his local town to do some shopping. As he was traveling down the department store escalator on his way to the exit, he accidentally dropped a 20-pence piece.
He looked around, trying to locate it, but couldn’t see it anywhere. As he left the store he thought to himself, “I wonder if that might cause any trouble?” Later that day, he turned on the news.
That very same department store had caught fire. Many had died. Early investigations, whilst inconclusive, pointed to something getting caught in the escalator’s mechanism, causing a malfunction and the ensuing inferno.
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