Malcolm: I can do your nails again.
Lois: I don't know what you could possibly do to improve them.
Malcolm: Well, we have to do something.
Lois: Truth or Dare.
Malcolm: Truth.
Lois: What's the worse thing you've ever done?
Malcolm: Total immunity?
Lois: Pinky swear.
Malcolm: All right, well, I'm not sure if this counts, but when the Harrises were on vacation I drove their car for a week.
Lois: Malcolm!
Malcolm: It's not as bad as it sounds. They left their window unlocked. And a lot of people leave a spare car key in the kitchen drawer. Except the Goldmans. They left theirs in a fake soup can in the cabinet.