"jaw breaker"
Ouch! I think I broke my jaw on this jawbreaker.
You're not supposed to chew them.
Then... how are you supposed to break your jaw?
No, you don't understand. You're being stupid.
You see, the product is named after what you're supposed to avoid doing with it, but would otherwise be tempted to do due to the category of the product.
Yes, I see. How stupid of me.
Is it really possible to break your jaw with a jaw breaker? I can see killing teeth, but breaking your jaw is even harder. How would a broken jaw even feel?