Last week I flew into SEA, and had to rent a car to drive to Bellevue. I had already exited the sterile area with other pax on my flight, when a TSO stepped in front of us, held up his hands and said, "Everyone halt!" He apparently wanted to clear the way for one of the airport vendors to bring a dolly load of crap through. I kept going. He stepped up to me and said, "Halt means halt!" I said, "Are you TSA?" He said, "Yes!" I said, "You have no authority to stop me." And I just kept walking. He was not happy, but what could he do?