My sister used to have every DVD of That 70s Show, and an upstairs neighbor who blasted porn at all hours. She complained to management many times about his disturbing activities. One day, instead of porn, she heard the theme from That 70s Show blasting on repeat, like the intro menu on a DVD. She checked all of the DVD cases and the player and one disc was missing. Management didn't believe her, but she got the lock changed and then moved the fuck out of there as soon as she could.