Via Twitter, I came across this link, which contains a clip (from Fox News, I think?) of a story about what happened to a guy detained by the TSA at the St. Louis airport. They were suspicious of him because he had $4700 in cash on him. They demanded to know where he got the money.
In response, this man asked repeatedly, "Am I legally required to answer that question?"
He never got a "yes" or a "no"--but was detained, and the TSA guys (he was recording their voices on his phone without their knowledge) threatened to make him answer to the DEA and the FBI.
Watch the whole video, it's about 8 minutes long. I thought the way this guy behaved was awesome--polite, calm, non-confrontational . . . and absolutely unyielding. Yes!
UPDATE: Here's the video: