This was a heated (aka drunken) discussion earlier:
CAGE MATCHES THAT WOULD PLEASE THE GODS
Here's a few I remember:
Jean Claude Van Damme versus
Stephen King versus James Patterson
Amish versus Buddhist
Mary Kate versus Ashley
Abe Lincoln versus Gandhi
President Bush versus Gary Coleman
Rob Zombie versus Marilyn Manson
CEO of Wal-Mart versus CEO of Target
Chuck Norris versus Paris Hilton
Crocodile Dundee versus Jeff Corwin
Metallica versus Megadeth
MacGyver versus Magnum P.I.
Ghost Busters versus A-Team
stereotypical Jesus versus stereotypical Allah
Barney versus Teletubbies