Why is it your favorite?
My favorite contemporary show is a toss up between Community and Parks and Recreation. These two shows, as well as Modern Family, have taken the sitcom and just turned them into something entertaining. Some even subtly, or not so subtly in the case of Community, make fun of sitcoms. The physical comedy in all shows, especially in Modern Family, is top notch as well.
The Office (US) is past it's prime, but those prime years are still well worth watching. The original UK series is also great television, bonus points for it being British humor that I actually enjoy.