During a summer quite many years ago, I played UFO (aka X-COM) with some friends and we played it a little too much. It is a turn-based game were you have a certain "moves" for each soldier, then take turns and let the computer move, and so on.
One day, I wanted to go to the toilet, but I stopped halfways thinking "Not enough moves left this round". Damn - I really needed to go! :)