okay, this isn’t a ghost story, but it’s the only thing that made sense.
at my last job my coworker and i were closing up for the night and i held the door for the last customer to lock it behind her. as she was about 8 feet from the door she turned around and shouted “come on, Crystal!” and then kept walking and left the store. i waited by the door without locking it, waiting for who i assumed was her kid, however the woman got into her car and drove off. after a minute we made an announcement that we were closed, but there was no response. needless to say we checked every nook and cranny for Crystal, but there was no one left in the store. our motion detector alarm did not go off that night after we had left, either. a year later and no one has found Crystal yet.