He practiced Realpolitik, a pragmatic approach that is often represented as Machiavellian.
He was called the Iron Chancellor because of a speech he made saying that "The great questions of the time will not be resolved by speeches and majority decisions...but by iron and blood."
He predicted that World War I will start because of "some damned fool thing in the Balkans."
Putting his poster on your office is a great way to piss off uber liberal college students.
"He who has his thumb on the purse has the power."
-Otto von Bismarck
SL students shit a brick when they see a picture of Otto von Bismarck on my professor's wall.