Found this today on the about.com urban legends page. “Welcome to Kenya, birthplace of Barack Obama.” This sign probably looks plausible if you don’t know any Arabic and can’t even recognize when all the letters are unconnected.
And here’s a photo of the original sign this was apparently created from:
The sign if located not in Africa, but in Oman.
And here’s a side-by-side comparison. All of this is courtesy of about.com: