It's hard to ask this without giving anything away, but at the end of the third season, I thought it was finished. I was surprised to see the fourth season sitting at the video shop. Given the ending of that, I'm wondering how there are now talks of a fifth season. Part of it's humour is that it can keep doing this!
Does it have anywhere left to go?
Creative Commons Share Alike Katy Mixon (Attribution: Robert Sebree/CBS)