Flip-flops are the preferred footwear of terrorists. When you wear flip-flops someplace other than the beach or the shower the terrorists win.

Also, cowboy boots have got to go. If you're not out punching dogies you shouldn't own cowboy boots.

Edit: Oh crap! I forgot about the shoe-bomber. Flip-flops may mean a safer America, even though I am forced to look at your hideous hammer-toes.