If you look up idiot in the dictionary it will have your picture. Ha Ha - Old Joke
I learned a new English term called Corpsing - itis when an actor can't keep a straight face during a comedy scene. Most famous for this would be Harvey Korman and Time Conway on The Carol Burnett Show.
So I was looking the word up in Wikipedia and it literally says at the bottom:
That's right, if you look up corpsing in the dictionary they have a picture of Jimmy Fallon.