October surprise

I've for so long feared a Bush-Rove October surprise--the idea being that in a close race they'd pop some big development at the last minute (capturing Osama bin Laden, withdrawing troops from Iraq, whatever)--that I didn't focus on the Democrats' prospect for same. What could Kerry/Edwards come up with that would swing the election their way in the last few weeks?

Discovering a nonwhite love-child of Bush? Maybe an under-the-desk intern? Perhaps, even, an allegation by Kobe Bryant's "friend" in Colorado about a similarly forceful tryst?

I'm open to suggestions, and to a means of effectuation thereof.