About 8 or 9 years ago, I was in the bathroom brushing my teeth before bed. It was around midnight and the door was locked, my family were asleep. Suddenly the door handle moved, so I assumed somebody else had woke up. I called out that I'd be out in a sec, expecting a reply but didn't get one. I carried on and then the handle shook up and down violently for about 5 seconds. Annoyed by their impatience I opened the door to find a dark, empty and silent corridor. I checked the bedrooms and everyone was asleep, and besides there wouldn't have been enough time for anyone to do that and get back to their room. Told my family in the morning and they swore they knew nothing about it. Weird!