Boing Boing has a post about a mod called Wolfengitmo for the original Wolfenstein which converts it into a Guantanamo Bay style arena. Instead of posters of Hitler and flags of the Nazi Swastika the prison is donned with flags of the United States of American and photos of George Dubya.
Not really playable as each player is bound from the start (so no punching) and no weapons - all you can do is run about collecting crosses and medpacks whilst being shot at from US Marines and mauled by guard dogs...
The original article has some of the screenshots and I like the touch of the health meter down the bottom having a bag over his head!!
Link to original article