"Will, please don't belch the alphabet."
"Will, stop looking at your sister!"
"Will, you are being so 8!" (as in acting like an 8 year old, which he happens to be)
I once told Will that he was not allowed to be 7, since most 7 year old boys are obnoxious know-it-alls. It was a joke, but he thought I was serious and was terribly upset as his birthday approached. He turned out to be a delightful 7 and is for the most part is a pleasant 8. But there are several moments daily that frustrate and then make me laugh at their obsurdity.