S3·E8 Laverne and Shirley Meet Fabian

Fabian's concert is sold out, but the girls still want to see him. The girls bet Rosie that they can not only meet Fabian but that they will have their pictures taken with him. Rosie agrees to the bet, and says that if she should lose she'll clean the girls flat with her toothbrush. Needless to say, Rosie is soon scrubbing the floors, toothbrush and all.