contradiction
Abe: I got a riddle for you, Sol. What's green, hangs on the wall, and whistles?
Sol: I give up.
Abe: A herring.
Sol: But a herring isn't green.
Abe: So you can paint it green.
Sol: But a herring doesn't hang on the wall.
Abe: Put a nail through it, it hands on the wall.
Sol: But a herring doesn't whistle!
Abe: So? It doesn't whistle.
Borrowed from Plato and a Platypus Walk Into a Bar...: Understanding Philosophy Through Jokes
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