I know that there are quite a few Weird Al fans here, so I thought I'd point out another great band who does a parody or two.
Check out www.bobricci.com. Great stuff. (And a LOT of original stuff that is just as good!)
My personal favorites have to be "Mrs. Claus" (Stacy's Mom), "Slimy Whiny Creepy" (Truly Madly Deeply) and "It Could Happen to U2" (Stuck in a Moment)....hilarious.