Just noticed this today:
See here for more details. Proof positive, it seems to me. Of everything.
UPDATE: After I linked to the Wikipedia entry, someone deleted the section I was linking to; fortunately, commenter Anderson posted a link to the old version of the entry, and I've revised this post to link to that. That sort of thing is one of the problems with linking to Wikipedia, though it's not that serious a problem when it comes to topics such as this.