Peter Straub showed up periodically on alt.books.stephen_king. King and Straub had said for years (and still do) that they tried to imitate each others styles when writing The Talisman. Because they did it so well it is impossible (or so they say) for them to tell who actually wrote what parts of the book. Robert Whelan didn't believe that and wrote lengthy posts directed to Peter Straub claiming that he knew many of the parts that Straub wrote simply because of the style being so different from King's. Peter argued with him for quite a while but Robert's posts just got longer and more frequent. After a few weeks Peter admitted to writing some of the parts in question.
In 2001 I was at a book signing at Texas Motor Speedway (odd place for a book signing, I know) and Peter Straub was there. We talked for a while and Robert Whelan's name came up. I asked him about it and Peter said that he really couldn't remember if he wrote those parts or not but he said he did because he thought it was the only way to shut Robert up. We laughed at that. I'm pretty sure Bev was there for that conversation.
Robert took part in many other discussions and never would admit he was wrong. But the argument with Straub is the one that I really remember.