Well, we haven't seen it until now, so ti can't be THAT popular . . . but it is kinda fun. Follow the Slightly Not Safe For Work link below (only because it looks like a naked girl is hugging her friend from behind.)
AT first glance this photo seems to show a naked girl posing behind a pal — but look again. What appears to be a saucy snap is actually an optical illusion created by her friend's bare arm.Nude illusion pic sweeps web | The Sun |News
The embarrassing shot has become an internet sensation and was this afternoon going viral around the world. It appears in an email with the subject "The awkward moment", with the line: "When your friend's fat arm makes you look naked."