Back to the Future (1985) ROCKS! Literally.
Michael J. Fox is perfectly cast as Marty McFly, the time traveling teen. And was there ever a more colorful character in film history than Doc Brown, brought to life by Christopher Lloyd?
If you know the history of this movie, you know that it wasn't originally meant to be a trilogy. But Robert Zemeckis and Bob Gale did a great job with continuity of the sequels.
My only logistics problem is with Back to the Future Part II (1989) -- the scene in 2015 where "old" Biff steals the DeLorean and gives the sports almanac to himself in 1955. How does he know how to operate the time machine? And how could he bring it back to the right time for Doc and Marty in 2015? Wouldn't the future have already been changed because of the book? I'll give a vanilla shake to anyone who can answer that question.
But it doesn't really matter. It's a fun roller coaster ride and one of the best films of the 1980s. Every American should see this movie.