S41E9 - Writing Emotions: Confusion

Costello: And you don't know the fellows' names?Abbott: Well I should.Costello: Well then who's on first?Abbott: Yes.Costello: I mean the fellow's name.Abbott: Who.Costello: The guy on first.Abbott: Who.Costello: The first baseman.Abbott: Who.Costello: The guy playing...Abbott: Who is on first! - Abbott and Costello