Your idea reminds me of this story from 2006.

Milwaukee resident Ryan Bird wrote "Kip Hawley is an Idiot" on a plastic bag given to passengers by airport security. As a result he claims he was detained and told that the First Amendment did not apply to security checkpoints.

http://www.flyertalk.com/forum/travel-safety-security/606142...

Kip Hawley was the head of TSA at the time.