Abbott and Costello "Who's on first"
Abbott and Costello doing the famous "Who's on first".
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Who's on First? is a comedy routine made famous by Abbott and Costello. The premise of the routine is that Abbott is identifying the players on a baseball team to Costello, but their names and nicknames can be interpreted as non-responsive answers to Costello's questions. In this context, the first baseman is named "Who"; thus, the utterance "Who's on first?" is ambiguous between the question ("which person is the first baseman?") and the answer ("Mr. Who is the name of the first baseman.").
Source: http://en.wikipedia.org/wiki/Who's_on_First%3F
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