By Emily Christianson, Hollywood.com Staff
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Thursday, October 16, 2008

5. Grease (1978)
Grease is all about Danny (John Travolta) and Sandy (Olivia Newton-John), but the movie wouldn’t have a leg to stand on or a big musical number without the sassy Pink Ladies and T-Birds baddies. Leather jackets, slumber parties and pregnancy scares proved these teen gangs weren’t messing around.