That sort of German scientist stereotype pops into my head. You know, like the medic from TF2. Goofy accent, tiny glasses with circular lenses, strong jawline, usually pictured with book in hand, maybe in a Nazi uniform.
And of course, Nazis themselves. It isn't that anyone thinks Germans are still Nazis or that Germany was nothing but Nazis at the time, that's just kind of what it's known for. Nothing wrong with that. I'm from the US, and I'll wager the equivalent for us is that sort of stupid cowboy asshole stereotype.
Edit: Ooo! And some crazy-sick porn. Seriously. No offense, but I thought America made some messed up stuff. You want some seriously disturbing stuff that will screw with your worldview forever, you have to go the amateur German route.