My favorite bit of pseudoscience. One who has a Napoleonic Complex supposeldy is overbearing, arrogant, or obnoxious because of underlying insecurity about a flaw, real or imagined. Things for which a Napoleonic Complex is often blamed include, but are not limited to: obsessive video game play, school bullying, or buying expensive cars.
The term, of course, comes from the name Napoléon Bonaparte, former military leader-cum-emperor of France. The theory goes, Napoléon's lust for power was driven by insecurity over his height (Napoléon was, in fact, shorter than most men of his time). Well, you have to have some sort of underlying problem to go for Russia, right?
c.f. "Small penis syndrome"