Some folks are like that. I always get weirded out by "toilet ghosts"... The door opens, but you don' hear anyone come in. You exit your stall a couple minutes later and the batroom is empty. Toilet Ghosts are usually explained away as a Touch-and-Go. (Flying term meaning to touch your wheels to the runway but then fly away again) Nervous poopers will open the bathroom door but if they see any other occupied stall then they immediately turn around an leave. This avoids a Silent Feet Stalemate. Silent Feet is when someone in the stall hold the belief that nobody who hears you poop can ever know who you are, on pain of death. So they will wait in the stall until everyone else has left, waiting as long as it takes. When two sets of silent feet try to wait each other out you get a silent feet stalemate.