Take the best elements from Seinfeld and Arrested Development and you have It’s Always Sunny in Philadelphia. Combining the social-degenerate-buddy formula (three men, one woman) with the beyond-dysfunctional-family element, Philadelphia creates scenarios that are so hysterical, wrong, appalling, familiar, embarrassing, uncomfortable, and entertaining, the show is addictive like staring at a car wreck when you know you shouldn’t…