I've know the word "doppelganger" for a very long time and I've not only never seen that movie, I've never heard of it. I first came across that word in some book, when I was a kiddo. It's rather late, I'm getting a migraine, and I have no idea what book it was; sorry.
LOL...I see I need to also teach you German words! :-)
Tonite is gonna get nuts and America is sleepin, glad I had a nap