1: Shotgun Wedding (I)
Sep 11, 1979
The Cunninghams and Fonzie go on vacation to Lake Pinewood. Richie and Fonzie get together with two lonely milkmaids, and, when their father catches them in his barn with his daughters, he says they will have to get married.
The crossover continues on Laverne & Shirley S05E01 Shotgun Wedding (II).