Who's on First?

Comedy routine made famous by Abbott and Costello

"Who's on First?" is a comedy routine made famous by American comedy duo Abbott and Costello. The premise of the sketch is that Abbott is identifying the players on a baseball team for Costello. However, the players' names can simultaneously serve as the basis for questions and responses, leading to reciprocal misunderstanding and growing frustration between the performers. Although it is commonly known as "Who's on First?", Abbott and Costello frequently referred to it simply as "Baseball".

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