US Customs is getting more and more stringent. I was yelled at for not writing my flight number down on that ridiculous piece of paper you have to fill out swearing you haven't been in contact with any farm animals while abroad. Who remembers their flight number?

Another weird thing is that, apparantly, if you are caught using your cell phone (at least at O'Hare) before clearing customs, you "risk having it confiscated". That's the warning that United Airlines gave us as we disembarked. They mentioned it 3 times, so clearly someone thinks it's a big deal. But why? I've been googling for an answer, and I found nothing.