From Thinkgeek:
Get two of the Tim Burton / Michael Keaton Batmobile (in a slightly modified size) with our Batmobile 3D Slippers. With an elasticized foot opening, you can order your feet to “Get in the car.” And with a no-slip dots on the bottom, these won’t be peeling out any time soon. And with two, you’ll always have a backup in case you have to batmissile one of them. We hate it when that happens.
