My dad used to tell a story about when he got a hearing test as part of an employment medical fairly late in life, and the audiologist asks him "You're left handed, aren't you?" because he could see the typical signs of rifle shooting related hearing loss in his left ear. Turns out dad wasn't actually left handed, but shot a rifle at school cadets 30 years earlier left handed because he could only close his right eye independently - it was easier to just shoot left handed than to try to learn how to look through the sights with his right eye.
