Truthiness
I'm writing an article on Wikipedia for our newsletter, and surfed around Wikiquote as well. The Truthifications made me really, really laugh: like this one--

"In the future you'll be able to inject this program directly into your eyeballs. The future is now! This is The Colbert Report!"

http://en.wikiquote.org/wiki/The_Colbert_Report


and then there's Dan Quayle:
"The question is: Are we going to go forward to tomorrow, or past to the back?"