When you get to US immigration make sure the green form is filled out perfectly otherwise you get sent to the back of the que which is a pain if you just missed out a couple of boxes. Also as everyone else has said US immigration people are like robots, they do a job and nothing else. If you've hired a car I suggest you pay the extra to have the quicker option as when we waited for our hire car it took 4 hours!!! If not just grab a bite to eat and enjoy. Matt