I caught a guy sleeping on a storage shelf once. It scared the hell out of me. He was in a quiet, almost fogotten location and had picked a low shelf with a tarp over it. When he heard me poking around, he decided he had better skedadle with the rest of the rats. He is lucky I didn't pee on him when I peed in my pants.
Anyway, there is a fellow who figured out how to fill his day. It's must be good work if you can get it!