http://www.engadget.com/2008/03/10/tsa-cant-believe-macbook-... =]

In the TSA grunt's defense, the training course probably involved something like "look for the hard drive, it's blue with a circle thing", "look for the battery, it's green", etc. Replacing a hard drive with C4 could yield a pretty sizable explosion...

Bonus points: Make sure the shiny white box actually turns on and there is pretty graphics on the screen.