We seem to be doing this backwards. On Monday we kicked off E3 week with an action-packed in-engine trailer for Mass Effect 3 featuring such bravado-soaked one-liners as "We need a plan to stop them!" "WE FIGHT OR WE DIE. THAT'S THE PLAN." Captain Shepherd that's a terrible plan and you are a bad captain.
Anyway, today we've got a live action trailer showing various humans acting all shocked at the imminent invasion of Earth. You know, the same invasion that'll form the backdrop of Mass Effect 3. You can watch it after the jump.
1:07 is totally the best bit. I wish I could remember what those guys were called.