Flip flops aren't shoes.

Today I had an epiphany.

Flip flops are the laziest shoes. Just think about that for a second.... Have you thought about it? If you're half-witted and still not convinced, I'll explain.
You don't need to think about putting flip flops on. You don't need to contemplate whether or not its worth putting them on. You just kind of slide into them. Other shoes, you actually need to make an effort. They're also the easiest to make. Can you imagine the person who invented them? Hmmm, I wonder what I can do with this piece of wood, and this bit of string. Now-a-days you just gotta punch a hole in a piece of plastic with some rubber. Blam! You've got a flip flop.
I'm not saying that the people who wear flip flops are lazy too, even though they seem to be exclusively sold to tank-top-jocks, shaggy-haired-surfers, and beach bums; but it is quite convincing.