Heh, I just thought this was amusing. Sometimes I run Fiddler while dugging some web apps that I work on, and the other day I was doing just that. I also was debugging a native process, and I noticed the HTTP requests that it makes to the symbol server.
There were a couple of DLLs for which is was getting a 302 message from the server (which means "temporarily moved" - a technique mostly used to redirect the client to another page) and it was redirected to the url "iseriouslydoubtthatthisurlwilleverexist", as you can see here (click for a full-size version):
I have no idea why it does it, but I just found it amusing... kind of makes me want to name a server on our network "iseriouslydoubtthatthisurlwilleverexist" just to see what would happen :)