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An American in Paris (with Gene Kelly and Leslie Caron)should also make the list. Great score, costumes, choreography, lots of variety. There are other classic musicals that have great dance scenes that are fun to watch, such as Frad Astaire's Firecracker dance in Holiday Inn and the dancing on the ceiling number in Royal Wedding but they don't usually want to sit still for the sappy "Moon/June" stuff, especially Bing Crosby crooning. They liked the Singing in the Rain dance by Gene Kelly, another great scene.
Also, I know we are trying to avoid the list being too mainstream, but my kids loved the early Star Wars and Indiana Jones movies and Jurassic Park (esp. the first one)which they did not seem to think scary (as I had feared). On the other hand, they found E.T. and Jumanji terrifying for years.
Another good one for teens was the skateboard movie "Dogtown and Z-boys" on which the Hollywood "Lords of Dogtown" was based. The skating and videography was amazing and the history of that part of the skateboard culture really interesting for kids and parents. Parental co-viewing advised to discuss the negative aspects (poor parenting and partying, especially after they start to get contracts and hang out with the wrong types).