The originator of "shaking it off," 1978 classic Grease made "Summer Nights" a real thing and gave us a host of other infectious songs that will remind you of the joys of adolescent Summers and first loves and the allure of the bad boy (oh, Danny Zuko, you heartbreaker, you). You'll love the throwback kitschiness; your tween and teen kids will love the soundtrack and pure exuberance.