I think either episodes from the 50s/60s, or the 80s reboot would be perfect for riffing. For such a long-running tv show, it's surprising you don't hear more about it, and I think it's worth bringing it out of retirement.

Plus, if done as a live short, you could do some audience interaction type of stuff. And I'm curious to see if Mike, Kevin, and Bill are Do-Bees or Don't-Bees (well, I'm fairly positive Mike is a Do-Bee anyway).