I don't know, there are a few movies that just look like a bad shroom trip. I always thought room 1408 was pretty heavy, but just saw vanilla sky (actually thought it was a crappy hollywood movie but turned out to be very complex), and damn just the whole concept of how weak reality is being portraied, as something unstable that can change at will (even tho it all gets explained at the end), at some scenes it really drew me entirely into the movie, at some points even feeling like i was having a bad shroom trip myself, or probably recognising elements from trips. Don't think any movie beats this one, the entire story is just twisted trough and trough, just find it weird i never really heard of this movie before, can't believe it isn't a big hit or something, perhaps because the viewing experience can be quite shocking at moments i guess.