Since we already have a thread about Stephen King's best book, and some of you guys are obviously big fans of him, which do you think was his worst book?

It could be a novel or a short story collection, and it doesn't necessarily have to be bad by itself, just weak compared to the rest of his work.

Personally, I think his worst was by far the story collection Nightmares and dreamscapes.

Most of the stories were so dull (or weren't even stories, like the article "Head down") and while there were a few good ones in the lot they weren't enough to save the book.

I have heard that his recent "The colorado kid" was pretty dull, but haven't read it myself.