A couple of years ago, I was taking longer trips and had to check a suitcase on occasion. As an experiment, I took a blank CD, wrote a title on it like: "Jenna Jamieson classics" (not sure I even spelled her stage name correctly). When you opened up the disc, I created a folder called "movie". Inside the folder, I had a single powerpoint slide saying something like (can't remember the exact wording):

• Greetings, Mr. Transportation Security Officer!
• You've taken the bait -- Sorry to disappoint you.
• You're nothing more than a thief and common criminal.
• Have a nice day.

I put the CD in a clear jewel case so one could clearly read the title. I put it in an outside compartment where it would be clear to someone searching my luggage that I had expected to arrive with the CD still in my luggage -- i.e.: I didn't place it on top of everything completely exposed. I locked the suitcase with official TSA-approved locks with the "I've been opened" indicator, so it would be pretty obvious who had been inside.

The little experiment proved successful twice in 6 tries. In each case, the screeners had opened the suitcase because I had the TSA greeting card and the lock indicators had been tripped.