Back to the Future Part II.

Why Part II, you ask?

Well, fellow Hubskier, let me tell you.

The first Back to the Future movie introduces you to your characters. You've got Marty and Doc and Biff. George and Elaine. You get a feel for the relationships between all of these people. You start to love their weird quirks and mannerisms. You feel for them as people.

Doc introduces you to the idea of parallel timelines while Marty tries to not hook up with his mom and in the end, everything ends up alright. Even Biff the bully has a generally descent life at the end, even though it might seem trivial. Then BAM. Doc shows up, tells Marty that they need to go to the future and the movie ends with a flying car that runs on garbage. Then begins Part II. It starts off with the FUTURE. There are FLOATING SKATEBOARDS. Jaws is a hologram. Biff is an old guy. Simply put: The future is awesome.

See, they can just start the film like this because you already have this deep connection with the characters. The writers can just go wild with story now because they don't have to waste any time introducing any concepts. So you get to see Doc and Marty head into the future, back into the fifties, and to an alternate dystopian timeline of the 80's. It's all the same lighthearted humor, all the nerdy sci-fi quirks, and none of the exposition. It's the perfect time travel film with clearly stated rules and ideas. (Plus it basically has the entire first movie summed up in about ten minutes about halfway through it, so you're basically watching two films at once.)

...of and I also really like Ferris Bueler's Day Off...