Who's On First?/ by Abbott and Costello

つべより輸入：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").

http://www.nicovideo.jp/watch/sm11759797