Is there any? I'm talking about things that you might buy on DVD and watch a few times, and maybe even annoy people with catchphrases from it (not films though).
Fonejacker is one that springs to mind, although I'm struggling for any more that will stand the test of time like others have, such as Alan partridge, League of Gentlemen, Brasseye, The Day Today etc.
Its can be anything funny, from sketch shows to sit coms.