I don't look like anyone famous, but when I was younger and living in Montreal, there was a guy who went to the same college that I went to and apparently we looked exactly alike. One time my sister walked up to him at a mall and asked him to go to for lunch (thinkin' it was me) and she then figured it out. Another time a girlfriend of mine ran up and went to give me a big kiss, but it was that other guy, she figure it out just as their lips touched, she then apologized and took off.
I'd have people who I never met talk to me like they knew me, and many times friends would bust my balls because they had said that I had ignored them earlier that day.
I never met this guy, but apparently that is who I kinda look like.