Videodrome, and almost every other movie David Cronenberg, directed comes to mind.
Errmm…Diceman? Bruce Willis was in Sixth Sense, not Harrison Ford (see your spoiler tag).
Can you explain this one? I’ve seen Magnolia a few times, but saw nothing to indicate the world is not what it seems.
Since Bruce Willis’ character is, IIRC, the character the movie really revolves around, you look from his perspective, and in that sense, it definitely qualifies.
Does Fight Club qualify?
Doh! :smack:
Blade Runner? There’s a lot of ambiguity about who is & who isn’t a replicant, also who knows they are & who doesn’t.
I think it would.
I would also add Mulholland Drive. That really messed with my mind 
I’ll second Mulholland Drive
I was going to say: anything by David Lynch would certainly work, I think.
The Hitcher. (I maintain that the Rutger Hauer character is a figment of the main character’s imagination.)
A Beautiful Mind.
The Stunt Man (1980)
The Manchurian Candidate
Baron Munchausen
How about The Others?
I don’t see how The Game could not qualify. Michael Douglas goes through the whole movie living in a world that is “not what it seems”. I don’t think it matters whether or not everyone else’s reality fits with his (I’m not going to spoil anything), but he lives in a different reality than everyone else for most of the movie.
I was just thinking about getting this movie the other day, now I’ll have to. It’s good.
Angel Heart.
Rosemary’s Baby?
The Stepford Wives?
Planet of the Apes.
Not really-because in the beginning narration, you hear Linda Hamilton explaining that they always sent two-one to kill, and one to protect.
Perhaps The Empire Strikes Back, when it first came out-when Palpy says, “The son of Skywalker must not become a Jedi!”
Only to find out that Darth Vader is Luke’s father!
Ocean’s Eleven – there’s a slick twist at the end.
Mirage with Gregory Peck. I hope this isn’t giving too much away, but its somewhat like Total Recall.