Sanford and Son 6x13

Lamont runs into Chuck Barris in a parking lot and he generously gives Lamont four tickets to a taping of The Gong Show, which happens to be Fred's favorite game show. Fred decides to try to be a contestant and sets up an act with his brother-in-law, Rodney and Lamont. However, at the last minute, Rodney hurts his back and can't be in the act.