Dilbert arrives at home carrying a briefcase. Dogbert sits on the front steps and says, "You should think about washing the car soon." Dilbert says, "You're right . . . It's just so easy to get used to it being dirty." There is so much dirt on the car that plants are growing on it and a bird has made his nest on the antenna. Dilbert continues, "But lately it's been affecting my gas mileage."