This once happened at my school.
During the year, there were some troubles at my school, so in return did they decide to teach us about Hitler and the Second World War.
Unfortunately, it was very basic. In the war of this; Hitler invaded Poland, then turned to France and the Low Countries, then tried to invade England, then went to Russia, etc.
Where it comes down, though, was when I wanted to tell my classmates why I'm interested in military history, the only girl at school then proceed to yell at me, "Was Hitler just elected at the Vienna art school, then this whole thing didn't happen!"
Of course, I was shocked, but then I proceeded to think... If Hitler was elected to learn at the art school, then our whole history would have been inevitable. Or that's just MY opinion.
What are yours?