I guess I'm lucky. I've never found anything too weird in my food. I have found hairs though.
Both my boss and husband went to Taiwan as they were working on the same project. The night market sold everything, from duck heads on a stick to the Taiwanese version of Viagra, snake blood. My husband was grossed out watching people walk around with BBQ duck heads on a stick. The open sewers were a real olfactory treat.
A pricey Taiwan restaurant had "dog-like animal" on the menu. My boss had ordered an appetizer and decided on the squab (pidgeon) as a main entree. The pidgeons were under a covered platter. She pulled off the lid. There they sat, the two of them, fully intact with their little heads and beady eyes. She lost her appetite.
I was just thinking. I'm not sure I'd be real charged up about preserving the rat head and green beans in my freezer either.