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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 ("Who is the name of the first baseman."). Abbott and Costello performed "Who's on First?" numerous times in their careers, rarely performing it the same way twice. Once, they did the routine at President Roosevelt's request. The routine was featured in the team's 1940 film debut, One Night in the Tropics. The duo reprised the bit in their 1945 film The Naughty Nineties, and it is that version which is considered their finest recorded rendition. They also performed the routine numerous times on radio and television (notably in The Abbott and Costello Show episode "The Actor's Home").