"Who's on First?" is Abbott and Costello's preeminent comedy routine. A & C usually referred to it as "Baseball." The sketch was allegedly based on prior burlesque routines with similar wordplay.

Synopsis: Abbott is managing a new baseball team and the players have nicknames which invokes the proliferation of nicknames in baseball. The infielders' nicknames are Who (first base), What (second base) and I Don't Know (third base). The key to the routine is Costello's persistent confusion over pronouns and Abbott playing the role of the 'straight man'.

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