Smoked salmon, which I truly enjoy, can hide "pin bones" that lodge inside your mouth. So can cooked salmon. I've also found bone shreds in some homemade sausages.

I was once preparing a venison roast given to me by my little brother and dug out the ball he'd used to shoot it. (Yes, ball. He'd used a .54 caliber flintlock.) If someone had swallowed it (unlikely but possible) they would have broken the bowl.