Two And A Half Men: Season 2, Episode 6

2 - 6: The Price of Healthy Gums Is Eternal Vigilance

While out at a family meal, Evelyn lets out a secret of Alan's past - he shop lifted when he was younger. Alan denies having shoplifted a toy as a child and fears he has a dark side, until Charlie admits he planted the toy on Alan to stay out of trouble himself. Alan finds it impossible to forgive Charlie until Evelyn asks Alan to move in with her because of Alan's dislike towards his brother. Title quotation from: The anal Alan, after Charlie questions his habit of flossing after every meal.