I tried to PM you to keep this off the board, but I am not allowed to. I am a member of another forum that has no restrictions on PM's, so I think the policy here is stupid. (Hear that moderators?)
Here is the scoop, straight from the Captain's mouth in the crew room. He was climbing out and they heard a loud pounding on the door. Scared the crap out of him, since no jumpseaters were listed on the FP/R. They turned around and landed. Turned out it was a hub worker who had fallen asleep in the back. This is not the first time this has happened. Several years ago, a hub guy was locked in the belly of a 727, I think, and flew the trip from MEM to somewhere on the east coast. He made it alive, and scared the ramp guys when they opened the belly. After that, they instituted a new procedure to make sure that no one got "left behind" again. Hmmm, maybe it is time to review the procedure.