But it hurts when I do this!

I had this conversation outside after school today, with a student who is not one of my 4th graders:

Kid: I just heard a loud snap, and I think it was my arm breaking!
 
Me: I see you moving your arm as you're telling me this, so your arm is not broken.
 
Kid: But it LOOKS like it's broken, because it hurts!
 
Me: OK, then you need to ask your mom to take you to the doctor when you get home.
 
Kid: Just now, it suddenly stopped hurting!
 
Me: That'll be $20, please. :)