Caution! Don’t hit your head on this warning sign

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…A sign in a shopping mall that warns people riding the escalator not to hit their heads on the sign warning them not to hit their heads on it…

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…actually, there is a logical explanation – the sign is a ‘blocker’, designed to stop people from being tempted to lean over the side and wave to their friends…and end up being decapitated by the steel girder which intersects with the escalator just out of shot at the top left…so, it turns out that a little judicious recursion can be a lifesaver every now and then…

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