The Absentminded Rommate

You share a cramped apartment with your roommate, a brilliant but extraordinarily forgetful hacker. He always forgets to pay his share of the rent and seems to have no concept of the dates that are important to you, like your birthday. Today is not different; you had an argument about his carelessness and ended up here, in this bizarre 'make up or never leave' room, with him still in his pajamas, scratching his head with a pencil behind his ear.