Ok, ya done it now -
Cube - one of those great movies that doesn't spoonfeed you all the plot, even as the credits roll. Some people wake up in a square room, realising it's connected to a lot of very similar rooms, then finding some have really nasty traps built in.
While it's not a horror movie, it also has one of the most memorable death scenes I've seen, I seem to rememberit cost over half the budget.
Cube Zero - while the sequel was pretty poor, Cube Zero pulls off the master stroke of going behind the scenes, showing those who 'run' the cube, making it work, yet still managing to leave so much unanswered, and possibly an even more evil set of traps.
Fermat's Room - worth trying if you like Cube or Saw, tho it's spanish with subtitles. $ mathematicians are called to a house, and end up locked in a room, (I'm not giving much away, the damn cover of the dvd has the worst spoilers since 'Planet of the apes', seriously? Statue of Liberty, on the cover?) then they're given riddles to solve, and a minute to do them, then the walls start to close in.
Idiocracy - not that obscure, but not nearly enough people have seen it. An average guy gets frozen and wakes up 500 years later, and the world's IQ has gone down the toilet, making him the smartest man alive. Just a genuinely funny movie.
Kung Pow - by the maker of 'Thumb Wars', he puts himself as the star of a martial arts movie, using camera tricks and editing about half a dozen old fight movies together then redubbing them. Funny as hell, if a bit dumb.
Yellowbeard - a little known pirate based comedy featuring most of Monty Python and a wealth of other top rank comic talent from the time. Features Marty Feldman trying to smuggle women onboard ship inside a hollowed out crocodile, saying he wanted a pet.
The Ref/Hostile Hostages - The xmas movie, as far as I care. Denis Leary is a burglar, hiding from the cops in Kevin Spacey's family home. Sadly Kevin Spacey's family is dysfunctional as all hell. Fun, but not as dark as you'd imagine, but not sappy like most xmas fare.
Clerks or Office Space - both highly recommended if you've ever had a job
Cypher - great sci fi movie about corporate secrecy, by the guy who made Cube.
Nothing - a pair of arguing flat mates discover they can wish stuff they don't like away.
Again I could go on and on, but I gotta stop somewhere.