Power supplies. I've got a copier paper box full of Sony power supplies. Every product they make has to have a different battery, plug, voltage, wattage, whatever so you MUST buy a new one if break/lose it, at a princely sum comparable to the price of the device.

Sony has 90% great, like awesome, design - then screws up the remaining 10% with either "meh, screw the user" or "hey, dig into his wallet" wrecking the rest. I've had two of their ultraportables, and try as I might to love them there's just one neurotic breakdown after another; my next is a MacBook Air.