A student working for us this summer had his xbox die on him while he was home in CA visiting his folks. He opened it up to try and discover what the problem was and found this:

Under the power supply. Too damned funny! His guess is the little bugger crawled in because of the warmth and then electrocuted himself against the power supply. After he scraped it out and took a metal brush to the board the xbox returned to normal. Too funny, he’s lucky it still worked though.