Apple makes Mac computers. Most people prefer to just use a PC, because they claim it is much easier. This advertisement sets out to prove them wrong. Justin Long is a newer, younger, popular celebrity that stands behind the Mac computer to say that it is easier to use and works better than a PC. The man standing next to Justin tries to act like him and wishes he was as cool, but he uses a PC so he isn't.
This is from: http://gigapple.files.wordpress.com/2009/08/mac-ad-surprise-02.png?w=590&h=335