Thriller film, also known as suspense film or suspense thriller, is a broad film genre that evokes excitement and suspense in the audience. The suspense element found in most films’ plots is particularly exploited by the filmmaker in this genre. Tension is created by delaying what the audience sees as inevitable and is built through situations that are menacing or where escape seems impossible. (Wikipedia)
Battle Royale has deep things to say about society and is an important landmark film. It is also a great movie if you like this kind of thing you sick bastard.