You can go up to any extent of registering a domain when URLs are coming quite affordably in your way and here is an example which is nothing but a landing page to tell you, how DEFINITELY is spelled :P.
Visit http://www.d-e-f-i-n-i-t-e-l-y.com/ just to see the number of times, it has been dugg!
One more in that list is – www.wwwdotcom.com which says like –
Attention:
You have reached the very last page of the Internet.
We hope you have enjoyed your browsing.
Now turn off your computer and go outside.