S1E22 : Behold! The 'Chestnuts Roasting on an Open Fire' Technique

Having been made hyper-sensitive to heat by Cologne, Ranma is trapped in his girl form until he promisees to marry Shampoo. Refusing to give up, Ranma takes a job at her diner, hoping for a chance to grab the 'Phoenix Pill' that's supposed to cure him.