I changed my mind. It is, without a doubt, 100% fake (and dangerously stupid).

http://errorlevelanalysis.com/permalink/c8761ab/

Plus, Snopes is working on it:

http://message.snopes.com/showthread.php?t=60180

I'm calling BS on that. My vote is that someone along the line photoshopped that image. If you zoom in on it, it looks doctored. Only a higher resolution original would prove it either way...