Last fall, Tammy Green began spotting Mary Poppins graffiti around her neighborhood. She briefly speculated that they were related to the Music Box's sing-along screening of the film, but, while that's come and gone, the images persist and, it seems, multiply. Like any good netizen, she's posted photographic evidence on Flickr, wondering "what the heck is up" with the stencilled, umbrella-borne nanny. If you've got the scoop, let us know, too.