in college... in the dorm building (it was a converted apartment building) there was one apartment on one of the floors that was left stark and empty with no furniture for some reason. The door never locked and there were no light bulbs in any of the fixtures... And one semester, somehow a dorm mattress on a streel frame was in that room and we quickly realized you could go in there (usually at night with no lights on since there were also no blinds) and have sex with a partner. That is what I remember happening, I also remember a lot of us discovered around that time we had yuck crabs... What happened is that so many horny students ended up having had a turn in there that the little things may well have been camping out in there too, on that one over-used mattress. One night, after word-of-mouth among the students pin-pointed the common room as the shared link, a consensus was reached and a group effort was made to get rid of the bed... It was thrown out of the apartment window. It fell from the 13th floor and hit a parked car.