Personally I think the answer to that question is Who. Like Who is on first. Abbott and Costello are some of my favorite comedic actors of all time. Its the type of classic humor that never gets old no matter how many times you see and/or hear it it always makes you laugh. Im a big fan of word play. The skit between the two is one of my earliest memories of a hearing a joke and gueninely laughing at its complexity.
Abbott and Costello-Who's on first?
Abbott and Costello-Who's on first?