The inner most bubble reveals hypocrisy in the nerd calling the nerd a nerd. The next stop is the cartoonist who is called a slacker for just sitting drawing comics. The final part is indeed unnecessary, which is why he is being called a joke killer. If you don't like it, fuck you.
This grinning man held this sign up during Pride in San Francisco, and about every 10 seconds he would say "happy", as if the thought of Bush and Cheney entering a suicide pact didn't already bring a smile to my face.
This is one of the official Haight Street banners in San Francisco. And yes, that man in the ski mask is being tasered in the neck, and if you look carefully, you can see that the hands say "Love" and "Hate".