The worst barkers are at DFW. Those people are LOUD.

"OK, make sure you have your 3oz or less liquids, gels, etc. in a plastic ziploc baggie. I said 3oz or less. If you do not put your liquids, gels, etc in your baggie it WILL be confiscated. You will not get these items back. If you do not have a plastic ziploc baggie one will be provided for you. You can find these in the bins to your right. We only allow one Ziploc baggie per person. Do not use more than one as we will have to confiscate any others you try to fill. If you have any lighters, please give them to the officer. We do not allow any lighters unless they are empty and in your checked luggage".

These people are loud. You want to scream "OK Deputy Dog I hear you, you don't have to scream. It's funny, they all seem to look like Gomer Pyle's loudmouth sargeant Vince Carter with the brush cut hairdo. I would just love to say to one of them in a sarcastic tone, "I know how much money you make, I know how much money you make. I swear they think they have a megaphone and each person going through thier line has never flown before or is a moron. This is only at DFW that I have encountered these people. Other airports have been fine. None of that loud screaming, especially at 6:00AM. God, I need an excedrin after going through security there.