Austrian psychiatrist, lived 1856-1939. Came up with things like the 'Oedipus complex', where apparently young males can become jealous of the father and want to fuck their own mothers. In my opinion, that could only happen if I were suddenly adopted by one of the Olsen twins... Hey! They're 18 now, it's open season!
If I could go back in time, I would go visit Sigmund Freud and kick him in the balls for being so stupid