Dr. Pepper bottle is all well and good, but if you really want to go for the gold you should try this game:
Spot someone with a popcorn tub in the rows ahead of you. From your seated position, commence micturition and count the number of seconds during which your urine is actually making it into the tub. Multiply that number by how many rows away your target was. Any score better than 30 wins you automatic entry into the hall of fame.