I have given this much thought as I am to travel soon. Since I am not allowed to take any liquids on board a flight, I will instead take an empty can to urinate in and drop it off at the security screener when I deplane. This keeps the seats clean for the next passenger, relieves me of any “pressure” that builds up since I am NOT allowed to take care of my business anywhere but in my seat and gives Janet Napolitano a reason to continue her ignorance.
That is a plan so cunning that you could put a tail on it and call it a weasel. :-)