The strangest recent FAQ submission let me know that it had been "proved on usenet" that Caitlin Keirnan had ghost-written Stardust for me, and did I have any comments? Denying it, I was told, would only demonstrate that I was intent on covering it up. Could I prove they were wrong?
A puzzler, that, like being asked to prove that you are not an identical clonal double impersonating yourself. So yes, I suppose I could (I wrote the book in longhand, after all).
But I'd rather admit that Cait wrote Stardust while I was busy fighting crime off-planet. When you're battling Denebian slime-worms, who has time to write? Thank heavens for the Legion of Substitute Neils. Gene Wolfe wrote Neverwhere for me, while the late Ian Fleming wrote American Gods via planchette.