So, in trying to run a campaign at 12 AM, nothing plotted out at all, and only a few simple things to accompany me on my journey towards this cressendo, I made an adventure. But by 3... or 2 AM, whichever subset of numerical timing you are under currently, it got quite hilarious and to the point that we couldn't continue because the character I was playing was being to funny.
Anywho, the adventure will consist of a point made in the Planar Handbook. That sometimes planes start to merge, or meld, into each other. I forget the term they used for this, but it's there; in the book. So, I've decided that the town they are in, Jiffylite (which came from a package I saw) and the rest of the world, is starting to turn in on itself, into a shape of a donut, much like the city of Sigil. In fact, it is becoming Sigil.
I guess I can now say that every so often (but not immensly often enough that it's ridiculous) Sigil actually "kills" a planet that is inhabited by some kind of peoples, consuming them and their society into their own current one. Intersting, yes? I think so.