great kid?

Peter was driving my a little batty while we were driving in Yellowstone.  I started to unroll the window and bossy old Peter said in an unpleasant voice "MOM! why are you unrolling that window?!"  My smart mouth answered back "to throw you out of it because you are driving me CRAZY!"
Quick to recover Peter replied "You wouldn't do that! I'm a great kid, just look at me."

Why is it kids always know when to back pedal and make you smile when your at the end of your rope.