NYC's Poster Boy easily slices up the MTA's new ad.

(click ad, via Poster Boy's flickr) This simple two-word transposition edit probably took the now-famous subterranean slicer (or one of his interns) about thirty seconds to execute. The art work replacement, a little longer. "Fixed" as they say on the Internet. Run, Poster Boy, run.
Here's some more of Poster Boy's old work.