Well, I just watched Battle Royale. Let me just say the plot outline on IMDB sums it up very well:

"In future Japan, the government captures a class of ninth-grade students and forces them to kill each other under the revolutionary "Battle Royale" act."

I think I know why it's falsely rumored to be banned in the US. Holy shit.

In a more serious note, it was really well done. I imagine the underlying message is more powerful in Japan (my guess is it's criticizing discipline in Japanese classrooms, but since I don't know shit about Japan, it's just a guess), but it was still a very powerful movie. When I first heard about it, I thought it would be kind of funny, but the movie kicked my ass. It did an incredible job portraying how friends would turn against each other, which is the thing that . Part of me actually does wish I didn't see it, since it did kind of disturb me.

If you think you can stomach it, I'd recommend it.