Come to think of it, there was another time I pissed in a bottle, several, actually.
This is for anyone who remembers Cuffs, the tiny sleaze bar on Hyperion in Silverlake (L.A.). I was chatting with this guy in an alcove behind the pinball machine, when the beers got to me and I had to piss. I really wanted to finish a quite interesting conversation, but I knew by the time I squeezed through the crowd, waited on line and got back, he would be gone, or we would at least loose the thread. I noticed that there was a row of empty beer bottles left on the shelf on the wall next to me. So I pulled it out (not an unusual occurrence for that bar), and proceeded very carefully to "refill" several bottles through the small neck, as we continued talking. I put each of these back on the shelf. A few minutes later, the barback squeezed through to pick up the empties. At first he noticed that certain ones were heavy, and started to put them back on the shelf, but then noticed that they were also warm, and took them without a word.
After our conversation ended, the guy left, and I went up to the bar for another drink. I discovered that all the rest of my drinks that night were free. Cuffs was just that kind of place...