For a good few months now, I've been chucking around the idea of a post-zombie-apocalypse sitcom. Not in any serious way, since I'm not a writer and am unlikely to ever be one, but I've mentioned it to a few people. I mean, "zombie apocalypse" is a situation, after all, and I've long held that you can find something to laugh about, no matter how grim the situation. And the genre standard of the house occupied by six or so survivors drawn from various backgrounds tallies up nicely with the usual sitcom small cast/one set structure.
Like all my best ideas, it's just been done by someone else.