Someone decided it would be fun to combine a Ped Egg, used for scraping dead skin off of your feet, with an optical mouse. What resulted is gross. Don't believe me? There's a video. Oh god, there's a video.
Yes, the Ped Mouse does just what it claims to do: lets you control your cursor while scraping away at your heel. Practical? No? Gross? Yes. But hey, if the goal was just to prove they could do it while also making something completely ludicrous, mission accomplished. [Stupid Inventions via Craziest Gadgets]