"Who's on First? is a vaudeville comedy routine made most famous by Abbott and Costello. In Abbott and Costello's version, 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 (\"The name of the first baseman is 'Who'\")."@en . "Who's on First? is a vaudeville comedy routine made most famous by Abbott and Costello. In Abbott and Costello's version, 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 (\"The name of the first baseman is 'Who'\")."@en . . . . "Who's on First?"@en . . . . .