Back when i was a student, me n a bunch of girls were chatting in the toilet and all of a sudden my friend turned pale, and quickly ushered us out. But before we can move, we heard someone flushing from the cubicle(back than there is no auto-flushing system). there was nobody else beside us, and all of us were by the mirror. We quickly rushed out from the toilet and only back in class, my friend who turned pale revealed she saw a shadow moving towards that cubicle where it "auto flush". after which we totally boycott that level toilet...