You want fun? Buy a bottle of a good quality (expensive) flavored milk drink, preferably a light colored one - banana or vanilla rather than chocolate. Enjoy it at home and rinse out the bottle. Now get the barium mixture (it tastes foul), put it in milk drink bottle and take it to the airport. Make sure the TSA screeners find it. Protest loudly when they confiscate encourage you to voluntarily surrender it - explain how it's your favorite flavor, how much you paid for it, how delicious this brand is, and so on. Eventually "surrender" it and enjoy the prospect of the screener drinking it with his lunch.