Don't ask me to explain why, but I am afraid that while I'm asleep, a huge man will break into our house with a big knife, hold the knife right above my sternum, and whack it down with all his might, thereby splitting the bone and somehow puncturing my ribs. Of course I will die.
Because of this, I'm very paranoid about my sternum in general. Even going to the doctor and having them put their stethoscope on my chest is unnerving. What if by some horrible accident he picks up a sharp instrument instead of the stethoscope and ends up splitting my sternum?? It makes me so worried!!