this one, I think, is going to be trouble

George has learned to tell knock-knock jokes... so Thomas immediately started saying "na-na!" and laughing hysterically.

He'll "comb" his hair with his fork and crack himself up at the joke. Even funnier when the fork has tomato sauce or peanut butter on it.

Here's a picture documenting something we'll just refer to as "the Nutella incident."

Thomas has also become quite the pro at conning rides from big brother and big sister.

I mean really, who can say no to a cute little face like that?