Can you jump on one foot?

We were at the doctor for Luke's (late) 3 year check up today. The doctor looked in his eyes, throat, checked reflexes, etc. Then, he set Luke on the ground and asked him to jump up and down. Luke did so happily. Then, he asked Luke to jump on one foot. Luke said "Sure!" and ran up to the doctor and jumped on his foot.

Hahahahahahahahaha. Seriously, I laughed the whole way home. The doctor said he'd never had a kid do that and that he was happy to have a funny story to tell the office. I'm pretty sure Luke hurt his foot. He jumped on it pretty hard. Oh well, that's what you asked him to do...