Ran across this via TweetGrid the other day…
While watching a Donald Duck cartoon from 1935, The Band Concert and some others, I noticed he did not have quite such an explosive temper as in later cartoons. With a little research on Wikipedia I found out Donald had served as a paratrooper and commando in World War II who saw fairly intense combat. This made me wonder if perhaps Donald suffers from Post Traumatic Stress Disorder (PTSD) related to his wartime service.