Men's restroom, 1st floor
Tic Tac Toe over the urinal
The way I figure it is when you are standing there doing nothing but urinating, it can sometimes get boring. That is what lead me to my ingenius game of Urinal Tic Tac Toe. I drew up a Tic Tac Toe board over the urinal and placed a big X in the middle square. I finished my business, zipped up, and left the bathroom. Next day I found an O in the bottom left corner of the Tic Tac Toe board.
Long Story short, I won at a game of Tic Tac Toe that took a week to finish.