At 7:48 this morning, Central Standard Time, a bomb exploded on a commuter train outside Chicago killing everyone on board. And that's the train you've been on. No, no, I'm right here, you're talking to me right now! A man named Sean Fentress was on this train. He, for all intends and purposes, is now you.
Clip from Source Code where Colter Stevens (Jake Gyllenhaal) is told what's going on.