Funny, funny Brody

Lately, if we tell Brody NOT to do something, his reply is:

(while doing thumbs up, he bends his right elbow and points it behind him-fast!... you really have to see it, but it's hil-ar-i-ous! I'm trying to catch it on video)

"I wanna do THIS!"

Don't ask where he came up with it, because I HAVE NO CLUE! All I know is that every time he does it we BUST UP LAUGHING!