http://www.techchee.com/2008/02/10/stupid-or-smart-gadgets-toilet-roll-hat-double-sided-shoes-and-electric-fork/

"When you come home, simply slide your shoes off at the entrance to your house. When you are ready to go out again, you can easily slide back into them, without the troublesome effort of turning your shoes around."

(Sorry. I'm off tomorrow cos it's MsWza's birthday and I've got that Friday feeling.)