Just last week, there was an unexplainable incident at work. I was alone in the ladies room, and the toilet a few stalls over flushed autonomously. The toilets in the office ladies room have motion sensors that flush automatically with movement. When I went in, I was the only one in there. No one came in either, there is a locking keypad on the door and when it unlocks it is very loud.
There was no one in there, I opened all the stall doors. It was quite unnerving!