The most horrific story I've heard of late relating to "extra bits" is the one about the human body/remains found in one of the main fuel tanks of a large jetliner... Apparently, he was an engineer who had been sealed in by a workmate during maintenance on the fuel tanks, not realising he was still in there.
Can't remember the precise details of how he was discovered, but I believe there was some kind of problems with fuel feed/indication.
Very sobering.
Rgds.
Q.