King of the Hill - Season 6 Episode 1 -

The episode opens innocently enough with Bobby's girlfriend Connie inviting him over to add some spark to her dying slumber party. But after Bobby's beaten up by a crasher, Hank urges him to enroll in a boxing class at the Y. That class is full, so Bobby enrolls in the next best thing: women's self-defense. There, he quickly masters the technique of targeting an attacker below the belt.