Women of a certain age will have watched Grease over and over again throughout their lives, sharing inside jokes with friends, family members, and colleagues. Now, another generation is discovering the movie and the stage show from which it was adapted. As with any older movie, certain things go over our heads as kids and young adults. Certain moments begin to take on a grander meaning as society changes and grows. These are all the things in Grease you notice as an adult.