The Andy Griffith Show - Season 4 Episode 27 -

Helen and Thelma Lou are horrified to see Andy and Barney escorting a couple of "fun girls" from Mount Pilot the night before the big dance. The boys know they were innocently making sure the "girls' got home alright, but it will take some fancy two-steppin' at the dance to get Helen and Thelma Lou to believe it.