I was looking at this slideshow of famous look-a-likes–it is actually pretty weak (I mean they have George Clooney looking like Cary Grant AND Che Guevara. It can really only be one, Biography.com. And also, saying Kathy Bates, or ANYONE, looks like President TAFT is just mean). But I stumbled across Luke Perry (who will always be Sideshow Luke Perry in my heart). He’s a pretty good treat.
Hello? I Forgot My Mantra. 
You are totally correct in what you say about the look-a-likes, but there were some good ones. Arthur Schopenhauer and Johnny Depp! And Luke Perry and Woody Guthrie are twins!