I was warned not to make any jokes when going through airport security, or at any point in the airport when travelling to or from America. Now, my general reaction to a given situation is to find a joke or a pun - usually a really groan-worthy one unless I stole it from somewhere - and airport travel and security is fertile ground for humour. It's just a shame that airports don't have any.
On a related, but less humorous note; a terrorists' goal is to instill fear in their target population. With all the paranoia, x-rays and the "we can see you nude through your clothes" things at airports, kinda feels like they've won, doesn't it?
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whatever you're doing you're doing it right