After he'd peed through his 2 second pair of undies and shorts (before breakfast) I yelled "What is the deal with the bathroom?"   My 3 year old took my hand, looked into my eyes, and said "Don't worry mom, I don't do it when I grow taller.  When I'm a big boy I won't pee-pee my pants."    I kissed his forehead, apologized, and said "you're right."

Why didn't I think of that?