On to the frivolities:
Coupling (2000-2004; UK)
By far my favourite sitcom, especially in the section of romantic sitcoms. Coupling has it all, brilliant, exceedingly brilliant, really, really brilliant, emphatically brilliant dialogue, great characters, especially of course the number one character of all shows of all time, Jeff Murdoch (more about him later) and a great cast. With every other sitcom, for me at least, there are lulls. Jokes are repeated, some segments are clearly better than others, the rewatch value isn't the greatest, with Coupling there is no such thing. I adore every single episode, the jokes, despite rewatching each episode about fifteen times, still crack me up and te completely whack sense of humour that Steve Moffat possesses, especially in Jeff's monologues, is still incredible.
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Jeff, btw, goes on to say "That's the first good thing that's ever happened to me, ever, ever!" just so you know.