Here's Lucy - Season 3 Episode 13 : Lucy Loses Her Cool 1974

Lucy is chosen on an audience participation game show. The host offers her $500 if she won't lose her temper for a week. When she's escorted off the stage, the host then brings out Harry & the kids, offering them $500 if they can make Lucy lose her temper! They do everything possible to make Lucy lose, but she overcomes temptation. Lucy manages to demolish a grocery store! The week passed. Lucy's back on the game show where the host awards her $500. But then, the manager of the grocery store enters & charges her $499.99 in damages, leaving her with 1 penny! Lucy gets mad & cries until the host reveals that her friends/family were in this charade & award her another $500!