What's the worst experience you've had at the movies?

Went to go see Lego Ninjago Movie this evening and it was a nightmare with the little girl next to me talking and running around all through the film and her mother not only not doing anything about it but encouraging her to do it. When I confronted her afterwards about it and told her off she had the gall to act like she was the victim in all of this. So annoying and such a terrible example to set to your kids.

In lieu of this, what bad movie experiences have you had with the terrible audiences?