What is this horror movie called?

I'm not quite sure, and google isn't of much help right now. But this movie I rented on Pay-Per-View about 4 or 5 weeks ago was a horror movie. It had something with this invisible killer in the air, and whenever people encountered it, they had no knowledge of when it would happen, and they would commit... show more I'm not quite sure, and google isn't of much help right now.
But this movie I rented on Pay-Per-View about 4 or 5 weeks ago was a horror movie. It had something with this invisible killer in the air, and whenever people encountered it, they had no knowledge of when it would happen, and they would commit suicide. I'm not sure what it's called though. Please help =]
Update: Ahh thanks everyone! I knew it was something I would remember eventually. Just needed some help ;)
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