Personification; the man to the left and right take on the trait of standing in for both the mac and the personal computer. Their clothes and stature in dialogue also supports this idea.
An advertisement speaking towards the Mac vs. PC.
Hyperbole; the image of a butt is alarming but put at this scale, relates to the amount of pollution and the disgust factor involved with both, using the restroom and the results of pollution.
An advertisement speaking to environmental pollution.
Apple advertisement found on http://www.onmoneymaking.com/who-is-the-guy-in-your-apple-commercial.html.
GFEP advertisment found via http://adtention.wordpress.com/page/24/.