"Who's on First" by Bud Abbott and Lou Costello may possibly be one of the funniest comedy sketches of all time.
On Thursday, Late Night host Jimmy Fallon enacted "Who's on First?: The Sequel". With Fallon playing the role of Abbott and announcer Steve Higgins playing the role of Costello, they got some additional help from comedy legends Billy Crystal and Jerry Seinfeld.
Video via Hulu.com. H/T OTB.