Series 1, episode 2 of Spaced. It's probably my favorite show of all time, it's so funny and clever and referential. I show it to everyone I can, and everyone is on board after the first episode and completely lose interest after "Gatherings". You need to know the characters a little better to get the "funny" in that episode. It sucks, because then no one wants to pick it up when things get really good. And it's not such a commitment! Only 14 episodes total! But yeah, that one is a bit of a dud.