Arnie and the water tower
Arnie can't stop himself from climbing up that water tower, much to his detriment. But why in the hell don't the townspeople -- all of whom know Arnie and his inability to control himself -- just lock up the ladder? If Arnie can climb up it, so could a careless child (which is all he is.) It's one of those painfully obvious solutions that is left undone just so that the movie can keep its plot device intact.
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