Somewhere on the Canadian prairies
Alas, time has passed, and probably with it the individual involved. But years ago, we had a rather rough Corporal who had the unfortunate happening as to be smacked on the head by a Harvard prop. The result was a long stay in hospital and a steel plate installed in his head. He was good for a single drink at the Mess. On downing the second, he would climb up onto the nearest object higher than the floor and wave a very tatty bit of paper, announcing loudly, "I can prove I'm sane. What about the rest of you b*****ds!"
His other rather quaint ability was that he would be standing there talking with you and suddenly, with no warning, fall asleep. Eyes closed, and rigidly upright, but asleep. He would be out for up to a minute when he would snap back awake and continue with the conversation like he had never left. If the conversation was with a group, he would jump back in right there. Frightening!!
One day some new Admin Clerk put him on a C.O.'s Parade. He just smiled and showed up. Everyone got all fell in and the Parade Commander was standing directly in front of our Corporal. As he started to give the required order, he noticed that our Corporal was asleep. There was a distinct pause until the Corp opened his eyes again. Then the parade continued. The Corp never was on another parade . . . but the Admin Clerk was.