The Flintstones (1960)

S1E16 Arthur Quarry's Dance Class

Fred and Barney enroll in dance classes at Arthur Quarry's to avoid embarrassing themselves at the upcoming charity ball. However, their cover story about joining the volunteer fire department crumbles when Betty and Wilma discover that Bedrock, being entirely made of stone, is impervious to fire. This revelation leads the wives to suspect that their husbands are sneaking away to meet other women instead.