It happens to all of us. You've just wiped for the third (or maybe 30th?) time on a boss. The mage decided it would be more fun to jog in circles than to target the adds he was assigned, and your raid leader's crunching numbers and calling out changes to the strategy while everyone makes the graveyard run.
You're already back to the boss's room, you're flasked up, and you've eaten your appropriate buff food. You know your job and are anxious for the kill, because your best-in-slot item is just sitting there waiting for you. All you need is the signal to go, and you'll be ready to unleash hell on this beast. It's during this anxious moment when you realize ...
You have to pee.
Suddenly, this has become your overwhelming priority. You start to stand up, but then, the raid leader sends out a ready check. What do you do? Do you hit Not Ready, make a quick apology, and race for the bathroom? Do you send your raid leader a whisper, begging for a few extra minutes? Do you hold it in, click Ready and fight even harder, knowing that the boss must die so that freedom can flow free?
Or do you just call for a clean up in aisle three?