We've all been there before. You're at the game, you need to go pee, and you will be damned if you're going to the bathroom during the action. So what does that leave you? Half-time (or intermission or whatever). And half-time is not a good place to be when you want to follow decent etiquette, not when 1000's of people all want to use the bathroom at the same time and there are lines at the urinals 20 fans deep. Take my advice, and use a stall; you'll be happy you did. And if for some reason that doesn't fit your needs, you should read the discussion on Etiquette vs. Law