Here's one that i heard from a friend.

There was this guy who was studying with a group of friends at Changi Airport Terminal 2. Naturally, this guy has to go to the lil boy's room (toilet). The guy went straight into the cubicle and started to take a pee.

Suddenly, he heard one of the taps running. The guy thought, "Weird! There was nobody in here when i came in, and i didn't hear anyone enter the toilet."