These real life situations are opportunities to say something great! For instance you could have tried out some of these lines:
IMPOSSIBLE, there is no real chicken in that burger! Maybe it's rat.
Sorry, lady that's not a chicken bone, the packaging plant reported someone lost a finger.
That's terrible! Absolutely horrible! I refuse to work in such a place. I quite. Then go on break.
That's not a chicken bone! It looks like part of a beak or a claw to me.
That's not a bone. I was clipping my toe nails earlier.
OK, I'll give you a free apple pie if we can keep this between the both of us.
What that little bone! A guy last week found an entire rat!
Of course you could always just start singing "Dem bones" and start dancing around the restaurant.
~NT