One of the best shows ever is a 90s sitcom called Joking Apart, which is forever confined to the abyss of obscurity, despite being written by Steven Moffat who has since become prolific for his writing on Doctor Who, Sherlock and Coupling.
Specifically, I think series 2 episode 1 is the funniest thing there has ever been, followed closely by series 1 episode 3.
I believe the 12 episodes are available on certain websites I'm not supposed to link here if you want to check it out.