One of American history’s most iconic comedy bits is Abbott and Costello’s Who’s on First? In this sketch, Bud Abbott and Lou Costello try to discuss the positions of a baseball team whose players have confusing names: The first baseman is named “Who,” the second baseman is “What,” and the third baseman is “I Don’t Know.”

Costello: Who’s on first?
Abbott: Yes.
Costello: I mean the fellow’s name!
Abbott: Who.