I think one of the best things in the world is when Josiah does something and he doesn't realize I can see/hear him.
Tonight he was supposed to be in bed, but instead snuck up on the side of the couch, to lay there.
I simply say "Jay, back in bed buddy"
He stands up, eyes as wide as they get and exclaims "HOW DO YOU KNOW THESE THINGS????"
"Mommies know everything."