King of the Hill - Season 3 Episode 11 -

After being taunted and pantsed by one of her students, Peggy loses it and spanks him. She is immediately fired, but Cotton and his old buddies start a campaign to get "Paddlin' Peggy" reinstated. Once she is back teaching, Peggy uses her reputation for violence to scare her students, and takes things too far, in true Peggy fashion.