I broke a wisdom tooth that was fully erupted - on a popcorn kernel at the movie theatre, years ago. I chalked it up to "oops".
I have also worked in food service. Even with the best of monitoring, some things will make it to your plate that shouldn't be there. Bones in boneless chicken or fish filets, for example. Pits in cherries or yes, even olives. Fingers aren't great. Or bugs. But both have happened in the news.
I had a moth on my pizza once. Fully grown with wings and all, and it was melted in with the cheese on the top. Called the restaurant (it was delivery) - and they refused to believe it. I said it was there and we just wanted another pizza - we would return the first one, uneaten. They wouldn't comply. They lost our business, forever. I brought the pizza back to them in a hissy fit and they still refused to believe it was their fault. What, I got the pizza, found a moth and put it under my broiler? Gross things do happen in restaurants, just as they do in anyone's kitchen.
It's the stuff that you can't see that scares me - the salmonella and the ecoli and the risk of contracting Hepatitis from food preparers and serves that haven't used extreme care in preparing the food that worries me the most.
"Said sandwich wrap was unwholesome and unfit for human consumption in that it was presented to contain pitted olives, yet unknown to plaintiff, contained an unpitted olive or olives which plaintiff did not reasonably expect to be in the food prepared for him, and could not visually detect prior to consumption," the lawsuit said.