Hide one of these at the checkpoint. The fun will last even after you are gone.

Annoy-a-tron
http://www.thinkgeek.com/gadgets/electronic/8c52/

Annoy-a-tron 2.0
http://www.thinkgeek.com/gadgets/electronic/b278/

EvilTron
http://www.thinkgeek.com/gadgets/electronic/c427/


Someone hid one of these in my company's web developers office. It took them 3 weeks to find it and they were all convinced they were going nuts until they did.



Or get one of these and want everything you are going to touch at the checkpoint while saying you can't be too careful about getting the H1N1 flu.

http://www.thinkgeek.com/gadgets/lights/8f84/