Well, I am german. I don't think I have to tell you what people from this region did, do I?
But other than the elephant in the room: Kicking of WWI wasn't really classy, either, but with that one it was basically a red barrel waiting for a stray shot - if it hadn't been the germans, someone would have started that mess. Other than that, germans never really were "nice guys" in history. I kinda regret that my babaric ancestors put so much pressure on the Roman Empire - on the other hand, I like the idea of us being the "angry, drunken guys" who the Romans would rather leave alone or recruit as mercenaries.
Well, let's come to my personal ancestors:
My grandfather skipped the East-West Germany border quite a few times back when The Wall was up. That's not the bad thing - it was kinda heroic and cool. No, the bad thing here is that someone in our family ratted him out. Twice. He barely got away both times, but we never found out who the traitor was - if my mom ever goes to Berlin, she might look into the old Stasi Archive to see who it was.
And, well, there was an old relative who always said that our family comes from a bunch of "Raubritter" - literally translated "robbing knights", knights who, well, robbed people and pillaged stuff. He always said our name was "Sonnenstein" back then... then again, he might have been talking out of his drunken sewage disposal unit.