Roger, you could attempt to create situations that require him to sift through his steaming pile of filth. If he is like most teenagers, he always wears the same shoes. Hide one quietly under the pile, and leave him to search when he is desperate to get going. Perhaps his game controller in the back of the closet/wardrobe. If he becomes accusatory ask him if he has been drinking or having problems at school, and tell him he can talk to you about it. The "cool" dad is the weirdest thing a teenager can face. Change his desktop wallpaper to My Little Pony. It's always enjoyable to toy with your prey.