Sometimes excessive stress can cause intestinal problems like a demon that climbs out of your rectum and kills people. It is rare though.
Ken Marino stars in Bad Milo as Duncan, a stressed out guy who finds himself a sufferer of vengeful butt-demon. When Activia is unable to help him with this issue, Duncan attempts to befriend the creature and keep its insatiable appetite at bay. Think Little Shop of Horrors meets the bathroom scene from Dumb and Dumber.