Humans don't pay attention when they watch movies for some reason. Many humans that have spoke to me about this wonderful film have said- " Why are there aliens? That's stupid!!" Well, first off, THERE ARE NO FUCKING ALIENS!!!!!!! What you see near the end of this film is advanced machines. A charcter by the name of Joe talked to David about this at the half way point of this film. He said- "Humans hate us, you know? They'll stop at nothing. They mad us too smart, too quick and too many. We are suffering for the mistakes they made and when the end comes, all that will be left is us. That's why they hate us. That is why you must stay here with me." WE CALL THAT FORESHADOWING, HUMANS!!!!!!!!!!!!!!