I'll Prove It

Me: "Alright, who smeared poop on the bathroom wall? And, more importantly, if that's what's on the wall then what's left in someone's underwear??"

Harrison: "It wasn't me, Mom, promise.  Look, I'll show you." (he promptly drops trou and grabs his ankles to give me definitive proof he wasn't the culprit)

Gavin: "I didn't do it either, Mom."  He quickly follows his brothers example and clears his name also.

Harrison: "Maybe it was Dad, we should check him."

Me: "Probably not a bad idea."

Steve: overheard us talking and interrupts, "I didn't do it and I'm not proving it."