I saw this today. I had forgotten how funny it is. It's a classic bit from the Masters of Comedy Abbott and Costello. Alyssa Milano posted it on her @TouchByAM Twitter account today. I watched and laughed and smiled a lot. So I thought it deserved a Blog Post.
It's the classic "Who's on First?" routine. Arguably their best work ever. Here is the history from Wikipedia:
"Who's on First?" is Abbott & Costello's signature routine. They always referred to it informally as "Baseball." Depending upon the version you are hearing, Abbott has a) organized a new baseball team, and the players have nicknames; or, he is pointing out the proliferation of nicknames in baseball---usually launching a variation on St. Louis Cardinals sibling pitchers Dizzy and Daffy Dean, before launching the routine with the infielders' nicknames of Who (first base), What (second base) and I Don't Know (third base). The key to the routine: Lou Costello's unwavering pronoun confusion and Bud Abbott's unwavering nonchalance.
Here it is in all it's glory! :)
Abbott and Costello perform the classic "Who's on first?" baseball sketch in their 1945 film "The Naughty Nineties" first performed as part of their stage act.