Why are you limping?

(Door Slams. Kid lumbers into view.)
Kid: (Emphatically) I HAVE A BUNION.
Me: What?
Kid: My foot hurts and I know I have a BUNION.
Me: Unless you're 50 years old or have been sneaking around in high heels all your life, you most certainly do not have a bunion.
Kid: Well, this foot sure hurts. (takes off shoe and waves foot in front of me.) Look at the part sticking out.
Me: Look on the other foot. I think you have the same sticking out part. It's just rubbing your shoe.
Kid: Nope. I don't think so. (Pauses to think.) It's got to be a hernia.
Me: (stifling guffaw here) It's not a hernia. Seriously.
Kid: But I can't walk and it hurts all the time- whenever I'm awake.
Me: Go to sleep.
Kid: You're not very nice.
Me: You need a medical terminology class.