Go Grease Lightning! The Best Facts About The Film

The ending was a spoof

In the end of Grease, Sandy gives up her good girl images and transforms into a bad girl to conform to that of the T-birds and Pink Ladies. Grease creator, Jim Casey claimed that this premise was actually supposed to be spoofing other movies.

In many other films, the rebel character usually ends up giving up their bad boy or girl phase and turns good. However, Grease creators thought it would be fun to turn this around and have good girl Sandy turn bad.