It went like this, I was sitting in my office typing up a report, thinking, "boy, I am sure tired and I really need to pee" when a Marine ran into the office screaming, "Someone fell off the aircraft and is unconscious!" in a very panicked tone of voice. I responded with the good old, "Oh shit!" and grabbed my bag and a stretcher and ran out of the office, on the way out I yelled into mantaince control to call 911 and right then our XO calmly said, "this is only a drill".
I noticed that the feeling of having to pee had totally disappeared and I was wide awake. I need to do this kind of stuff more often.