Grease is primarily about the unlikely romance between greaser Danny Zuko and good girl Sandy Olsson, but I always found more emotional resonance in the sub-plot concerning the rebellious Rizzo, played by Stockard Channing.
Rizzo provides comic relief but also has a pregnancy scare that complicates her relationship with Kenickie, and in one of the film’s most touching scenes (embedded below) she gives us a rare glimpse of her vulnerability.