The celebrity look-alike meme
BIIYNI, but I think the technology has a way to go, yet. For grins, I fed it five different pictures of me, and it seems fairly sensitive to aspects of the pose, or the shape of the mouth. In all the "matches" there were only three duplicates (Barbra Streisand, Anjelica Huston and Jena Malone), each matching two of the five pictures.