I really, really don't get it. There must be some stupid people in the world.
What would posess a person to entertain for even half a second that anything like this is remotely witty or funny? I have heard one or two arguments of "Well, maybe they're p*ssed off with extra security or venting" or something along those lines. What a crock. The Jerricho stamp of "NEVER TO BE ALLOWED AIR TRAVEL AGAIN" in the passport is looking like a feasible introduction.
The shallow end of the gene pool looks to be getting a little fuller. Perhaps it's time to turn the filter on.