I started getting a migraine this afternoon, and took aspirin. It's mostly gone, but the aura has now started doing a reasonable impersonation of novocaine in my upper jaw, right about at the time where it's not quite numb, but starting to make your nose itch. A slight shimmery quality around the nose and upper lip. This is the weirdest one yet.
And I think Andrew has something when he commented it's sort of like migraines are a software error of some sort, rather than a hardware problem. The more I learn about them, the more I notice science still doesn't know a whole heck of a lot about them. They're kind of a black box.