The Battery Eater, by David Dear, sucks the remaining juice from AA batteries. He's magnetic, so you stick him on the fridge, throw in a battery, and his eyes blink with zinc-carbon ecstasy until he's munched all the power. They cost $12.85 from giftmonger.com. I have one of these, except it looks like a television remote and changes the channel and volume on the tv. When it can't do that anymore, I pronounce the batteries dead and throw them at rival fans during football games.
Battery Eater Munches On Remaining Power [redferret]