Random Weirdness

Last week, apropos of nothing I could see, a small rectangular mirror was taped to the outside of the frosted-glass window in the door to the men's room in my building. It was just above waist height, and tilted so that the only thing a person could see when walking up was one's crotchular region. It was up for a week, then apparently fell off and sat on the lid of the nearby recycling bin for a few days. Now it's gone altogether. WTF?