At night, Mom calls for Calvin, who's outside with Hobbes. Calvin tells Hobbes to start the stopwatch. Hobbes asks if he shouldn't answer Mom. Calvin says she doesn't see them, so she can't prove they heard her. Calvin says the trick is to listen for the tone of voice and answer before she gets mad enough to come looking for them. Mom calls again. Calvin says they now act innocent. He yells back, asking if Mom is calling for him. Mom says to come in, it's getting dark. Calvin tells Hobbes that was a tactical error, because darkness is relative. Calvin says it's not dark, because he can still see his hands. Calvin asks for another ten minutes, and Mom says no. Calvin asks for five minutes, and Mom says no. Calvin tells Hobbes she guessed his five minutes were her half-hour. He says they'll go for a fake agreement. He yells that he's coming in. He tells Hobbes they can stay out until Mom figures out he lied. Hobbes says they've dragged it out 53 minutes so far. Calvin is going for the record. He throws his shoe and says he lost it. Hobbes says every minute outside and awake is a good minute.