Happy Days S07 E11 Fonzie Versus the She Devils

"Those were the days of the 1950's...filled with innocence and the promise of even better days to come."

Unknowingly, Richie, Potsie, and Ralph are invited to a party hosted by the She Devils gang in which the Devil who brings in the biggest nerd wins a $100 prize. After Richie discovers the purpose of the party, he and the guys head for the door. However, several Devils come in carrying a sack containing a guy who jilted the sister of the gang's leader. The guy is Chachi.