The Simpsons (1989): Season 17, Episode 5

17 - 5: Marge's Son Poisoning

Observing that Marge is lonely, Bart offers to spend time with her. After they go on tandem bike rides and decorate Bart's tree house as a teahouse, the bullies from school dub Bart a mama's boy. When Marge finds out that Bart's schoolmates are teasing him, she gives him the necessary tools to win back his reputation. Meanwhile, Homer teams up with Moe and joins a professional arm-wrestling circuit .