Lois: What? You can't sleep?
Hal: No, I have this terrible feeling we've forgotten something. Let's see: trash, locks, lights... Oh, well, whatever it is, I'm sure it can wait until tomorrow morning.
[the next morning, Hal and Lois walk into the kitchen and find Dewey stood in a corner facing the wall:]
Hal: Oh, boy. Alright, son... Son, I think you've learned your lesson.
Dewey: Ok. Thanks, Dad.
Hal: We've got to stop doing this.