Just in time for the thanksgiving holiday travel rush, here's an idea to have a little fun at the expense of the TSA.
Go to your local hardware store and buy some aluminum foil tape. It's usually sold as an accessory in the insulation department.
Go to your local department store and get a stupid-looking-white-sort-of-male-person's-conservative-kind-of-middle-of-the-road-cotton-undergarment (AKA T-shirt).
Cut the tape into thin strips, and form block letters into witty sayings. Stick the letters on the T-shirt. They should show up on the TSA scanners like so: