My dad always tells me a story about when he used to work at Taco Time back in the 80's.
Once or twice a week, a woman would walk around the back of the building to where the bathrooms were (they were on the exterior of the building) and lock herself in the women's bathroom.
She would proceed to take 1-2 hours, gradually eat a cake, throw it back up, and smear it all over every surface in the room. By the time she finished, there wasn't a square inch of the room that wasn't covered in a cake/vomit mixture.
She would get away with this by sneaking back there when the employees were too busy to notice. She did this about 8 times.
One day, my dad was cleaning the dining room, and noticed a woman walk back towards the bathrooms with a sheet cake and immediately recognized her.
He gave her about 20 minutes to get going and to make sure it was actually her, and after hearing her vomiting through the door, he took his pickup truck, backed it up against the door (the doors opened outwards), and barricaded her in while he waited for the police.
When they showed up, they opened the door and it was the same scene as usual, cake and vomit everywhere.
He did feel bad for the cops who had to arrest/touch her though...