I had one coworker who would steal food from everybody. Oh, and we worked at a childcare facility. So when I say "stole food from everybody," I mean yes, everybody.
She raided children's lunchboxes while they were in the coat/backpack room. She raided employees lunches in our separate fridge. She went into the refer with snacks and raided those. She'd go through five or more juice boxes to satisfy her thirst. That kind of thing.
We jumped on her ass. We told her to knock that crap off. We complained up upper managment. Management gave her a limp handed finger waving.
Then one day we made crafts with the kids, making kid safe plaster; flour, salt and water. Everybody made their fun little thing and we baked them to dry them.
Yep. You guessed it, the coworker was spotted later with several of the kids' projects in hand, munching away on them like they were cookies. (WTF there was nothing in them to make them all that palatable.)
Well one of the kids spots HIS project in the coworker's hot little hand, and screamed bloody murder when my coworker bit right into it. There was a lot of chaos then; screaming and crying children, adults trying to figure out what was wrong, and our guilty coworker sitting there with a bitten project in hand and a stack of them by her side.
She had already eaten several of them by the time she was discovered, and the poor kids who had made them were pretty much inconsolable.
Management was finally forced to fire her, as mommies and daddies had quite a few words to say about their children coming home crying with a laundry list of things that had gone missing from their lunches and the culprit now caught red handed.