I've never found anything in my food that shouldn't be there. However I sometimes get food that is just horrible in one way or another. Just last week-end we went out to breakfast with my son and his wife and I ordered eggs benidict that came with melted cheese over it. Needless to say I did not get breakfast because it took too long to get our first order and we needed to get on the road and head back home.
I don't know if I would have had the appetite to eat anything if I had found anything in the food.