Bedknobs and Drumsticks

S3, E19: Reuben arranges for the Partridge family to make a TV commercial for Erwin Tully, owner of a large take-out chicken outfit. Up until now, "Uncle Erwin" has been making all his own commercials, very corny ones complete with chicken costumes. His sales have dropped, and he feels he needs a new image. The family films the commercial; the setting is a picnic: all the kids are playing and enjoying Uncle Erwin's chicken. Everyone is very pleased with the ad, everyone but Erwin! He feels something is missing -- chicken suits! The Partridges are 100% against it, but are forced by contract to make another commercial. They try to make it as bad as possible, hoping Erwin won't like it and use the first one. He ends up loving it. Erwin is going to preview his new commercial at a convention for all his franchise owners. Shirley realizes everyone there will hate the ad. So, when the conventioneers assume the commercial is a joke and ask for the "real one," Shirley saves the day by having the first ad ready to be shown.