That you can't be totally sure that it actually is Virgil but you just know it is, is part of it. That he is in the center of the frame, but your eye is drawn anywhere but, is part of it. That a former professional wrestler's picture was taken outside the gaudy Madame Tussauds in chintzy Times Square, is part of it. That there is a pile of horse shit, is part of it.

Mostly, though, it's the feeling that even though he's probably trying to sell autographs, it looks like someone left him outside while stopping in the bodega real quick for a pack of smokes.
(Click to enlarge)
h/t Shuan