S6, E36: Wally's class has planned an all night graduation party at the country club. Kathy Gregory, who Wally plans on taking, is forbidden to go by her parents. Wally goes over to convince her parents what a fine young man he is and that there would be no alcohol at the party. Wally wins them over and they agree to let Kathy go. The party is a success; however on the way home a passing drunk knocks Kathy into the water. Her father assumes that the party was rowdy, throws Wally out and forbids Kathy from dating for a whole month.