It's been a while since I worked at the theatre, but I just found this sub, so...
We had a bad customer who was known for buying tickets to horror/slasher type movies and then leaving early because of disturbing imagery.
At one point she apparently got fed up with it, and went after my boss for half an hour,
screeching at her in the hallway about how terrible we all were to dare show such things in a family theatre. Unfortunate, but not worthy of a tale in and of itself.
We did some hiring over the next few months. Part of the benefit of working at a theatre was free movies for you and your family, as I'm sure most of the readers here would know.
$NewEmployee calls in and asks for permission for him, his mom, and his brother. In they walk near starting time...and you guessed it.
His mother was the same woman who'd spent all that time and caused all that trouble.
I wish I could say there was a satisfying end, but somehow, nobody else ever seemed to make the connection, or have any idea why we shouldn't let her see movies free.