Spaced is an incredibly hilarious sitcom http://en.wikipedia.org/wiki/Spaced. It's a shame that its only 2 series, to quote wikipedia:
"It is noted for its rapid-fire editing, frequent dropping of pop-culture references, and occasional displays of surrealism. Two series of seven episodes each were broadcast in 1999 and 2001 on Channel 4."

Still, a 3rd series might be popping up sometime soon :)