I remember a documentary a few years ago a PR Spitfire pilot recalled partying a bit too much the night before the mission. Having taken off he needed to pee, but at altitude his bits and pieces had shrunk in the cold and he couldn’t reach the tube. He subsequently peed himself and it turned to ice on the inside of the windscreen. So, 30,000 odd feet over Germany, unarmed, and chipping frozen urine off the windscreen. Those were the days..