I don't know the title of the episode but it's where there is a dance contest and Joanie is jealous of this one cheerleader and she wants to be on the football cheerleading team. There is a bet between her and the girl that if Joanie wins she'll win a position on the team, but if Joanie loses Fonzie has to get a crew cut. I don't think that was a Russain dance, was it? I think the title of the song Fonzie dances to is called... The Kowasaki. Or the Chicowski. It sounds like that!