Michael Fassbender -- Pretty Girl In For Big Surprise

Michael Fassbender chatted it up with a very pretty blonde girl last night in London, and you gotta wonder what she was thinkin' ... as in, "Is that a banana in your pocket or are you just Michael Fassbender."

MF was in London, outside the Groucho club in Soho. The lady seems pretty calm about the whole thing. It's unclear if she recognizes Michael ... after all, he does have his pants on.

Michael is famous for "Shame." He's also famous for his extremely large penis.