Mountain Dew purchased at an American airport
Heh, that's how I was first introduced to it. I'd been up for something like 18 hours by this time, and still had a lot of travelling ahead of me. I was thirsty, having rapidly consumed my minuscule quota of carry-on liquids, and just wanted something to drink. (I know now to take an empty bottle through security and fill it up later.) I'd heard about Mountain Dew, and it sounded tasty, so I deposited my first tokens of the unfamiliar, eagle-bearing currency into the vending machine. Out popped the green bottle, which I quickly drained. Curiously, I didn't feel tired any more. It was only later that I learned I had stumbled upon one of the most caffeine-laden popular soft beverages the civilised world has to offer. I just wish they sold it in the UK...
Incidentally, why was everyone at Denver International white, except for the baggage handlers, who were exclusively black? I hope it was just a coincidence of shift scheduling, rather than something a lot nastier and more deep-seated.