Degrassi Junior High (1987)

S1E5 The Great Race

Melanie worries that her small chest might keep her off the school swim team. After repeatedly voicing her frustration over her mom's refusal to buy her a bra, L.D. decides to take her shopping at the department store. Once she arrives at school in her new bra, Melanie faces a wave of mockery and teasing from her classmates. During the big swim meet, when Joey publicly comments on Melanie's chest, L.D. has had enough and promptly shoves him into the pool.