The movie started with a (Black, think he was Dennis Haysbert, or looked like him) guy jogging in like a desert kind of climate, and dead birds were all over the path, and the sprinklers were kind of dying out, and spewing gas, he started coughing and ran away.
That or in a classroom with these guys in detention.
Then to a soccer game (I think) and after a while, sprinklers went off and started spewing gas, then they all started coughing.
-Skip a bit-
They're all in a building sealing it off and stuff. The gas is poisonous.
Anything you can give me off of that? Google isn't helping at all.