Gross! That is why I don't like to dine out too often.
About a month ago, I had a can of Bumble bee premium white albacore tuna. After "chopping" it up and making tuna salad, I chomped onto something VERY sharp and cut my gums. I spazzed and spit out a BONE! Totally pissed, I called the customer service line and the rep told me that it was quite a common occurence and treated me like an idiot. It really angered me and I'm passing on tuna these days.
Granted it's not a worm, but it actually injured me! haha