Family Guy/South Park/American Dad/Simpsons. I really just don't get what part of these shows anyone can find funny. To me, they're a pile of godawful tripe.

Also, as people have said, the whole club scene. Why go to a sleazy club which plays crap music, it's full of people who're way too pissed, or way to promiscuous and you have to shout to be heard.