"Who's on first?"

Because every baseball fans needs to be acquainted with this, and I'm sure that most of you are.

Although Bud Abbott and Lou Costello rarely ever did this routine the same way every single time that they performed it, this version, from their 1945 film "The Naughty Nineties" is widely considered their most "classic" version, at least of those which was ever captured on film or recorded.