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I remember seeing a movie on uhm.com and it was definitely a newer film, from the way it looked. There were the rejected high school students, all of the outcasts who were normally tormented, and I believe it's on the night of a dance, like Prom, the outcasts drug the punch at the dance. When all of the students wake up, they're in the middle of the room in shackles connected to the floor.
All of the outcasts were wearing masks, and I belive one of them was specifically a gas mask. And it continued in a Hostel style thing, with random torture devices and techniques, and I've been wondering what the movie was!