Went bar hopping with some friends a while ago and one of girls in the group had a habit of running off when she got drunk and getting into trouble. As soon as we realized she was gone everyone split up to look for her. I went to check the restrooms. The bar that we were in had one restroom for both guys and girls but multiple stalls. I find a stall with the door slightly open and hear weird noises from inside, figured she must be puking in there so I barge in. It wasn’t her, it was actually 3 guys in a pseudo human centipede threesome. Backed out slowly, had a cigarette, and called it a night.