Evan Roth has been putting metal plates with messages and symbols cut into them into his carry-on luggage when he goes through security at the airport.
Here's Roth's idea, which he calls "TSA Communication" and tells me has already made it through three trial airport runs: Take a metal plate, stencil and cut out a message -- words or an image -- place the plate at the bottom of your carry-on bag, and watch what happens as the TSA employee operating the airport X-ray machine notices ... or doesn't notice.
So far, he's used plates with outlines of the American flag, a "NOTHING TO SEE HERE" message, and something he calls The Exact Opposite Of A Box Cutter, a plate with a box cutter shape cut out of it.