Each end of a ten foot length of rope is tied securely to a man's ankles. Without cutting or untying the rope, is it possible to remove his trousers, turn them inside out on the rope and put them back on correctly? Party guests should try to answer this confusing topological question before initiating any empirical tests.
--from "Puzzling with Martin Gardner" (December 1995 Scientific American, p.26).
Give up? The answer is...
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