That would be the $230 I spent on a Roomba Pro-Elite Robotic FloorVac. I blogged a while back about impulsively buying this seemingly nifty device and about the trouble I had with it (primarily because long hair would coil around the brush axle, which you need extract annoying little screws to remove). I parked it under a sofa back in April and forgot about it until I suddenly felt the need to move the furniture around and saw the thing on the floor. So, I picked it up, and the rubber tread, slightly stuck to the carpet, tore and peeled away from one of the wheels. Ever the optimist, I think: good thing tomorrow is trash day, and now I can throw away this thing I never liked but had been keeping around because I'd paid so much money for it.
Bonus information: I suddenly felt the need to move the furniture because my iBook is in the repair shop, so I'm blogging from my desktop iMac over here next to the east wall of the big room, and given the position of the high-backed sofa, I'd been having to lift my arm too high to remote control the TiVo, something I seem to need to do while blogging quotes from "Hardball," "The Daily Show," etc.