American Beauty

Sex Trek: the Next Penetration

I was about to say Borat, but then I realized it would make for a great point n click game. Most movies that would be hard to turn into a video game would probably make for good cinematic games and/or point n click.

The Straight Story

These are two very different questions.

To the first question I'd say: you can turn any movie into a game - whether it will be a good game is another question entirely.

To the second question the answer is a clear "none...and all of them". Since you'll never know whether a game based on a certain movie will turn out to be good or bad, you can't just say "well, this movie should never ever be turned into a game!"

I hear the online multiplayer racing sections are quite epic.

Un chien andalou

Complete with a mini-game of eye-slicing!

Snakes on a Plane
Willy Wonka and the Chocolate Factory (1971)
Ghost
Ghost Dad

Good list there. I love the idea of trying to make a film based on Wild Strawberrys. Have to take some points away for Shoah though. I said no documentaries in the rules! :p
That might be the best one yet!

A Serbian Film.

Nah, just get on your lawnmower and drive. Instead of a "walking simulator" it would be a lawnmower driving simulator. lol

Leaving Neverland.

Although, if anyone has any idea on how to turn it into game, I'll be happy to hear them.

I was about to suggest 'They Shoot Horses, Don't They?* but then realized that it would translate nicely into a competitive dancing simulator.