Planet of the Apes--the original, of course. I need a good chunk of time between viewings; years, at the very least.
The Usual Suspects--you can watch it twice: the second time for picking up all the clues, once you know what was going on. Once you've done that, what is there?
A lot of twist-at-the-end movies are like that. The second viewing allows you the fun of reviewing clues; unfortunately, it can help confirm plot holes you might have missed the first time. With (the first film version of)
Planet of the Apes, even if you forgive the use of English and human development on a planet the astronauts take to be alien, I really wished they'd bothered with some excuse for these astronauts to never look at the night sky after they landed.
The measure of a well-made film that happens to include surprises the first time around is how much it continues to entertain with the surprises taken away. While I guessed the surprise about the
Sixth Sense midway through the first viewing, I find it just as eerie on repeat viewings.
Maverick is just as funny, slightly more perhaps, when you know part of the con going on.
I don't think most people remember the 1960s
Planet of the Apes primarily for its twist ending, but rather for the new experience of watching fantasy creatures treated as leading characters in a film that wasn't for kids, played by famous actors covered unrecognizably in makeup. That was a new and daring idea at the time. When I first watched those movies on TV in the 70s as a child, even though the makeup technology may seem primitive compared to now, it seemed freakishly realistic at the time and the novelty was still a strong pull. And they had many scenes written with wit and humor. So even today I can watch an old
Apes movie to enjoy scene by scene, often catching it on TV without having to watch all the way through, reliving that novelty entertainment.
For me I guess the common denominator is enjoyable character interaction, whether it's a comedy, drama, action film, fantasy, or whatever. That's why I never get tired of the original
Stagecoach.