Vidal once called William F. Buckley Jr. a “pro-crypto-Nazi,”. Buckley sued, and Vidal apologized to the judge: “It was a modest slip of the tongue, I was searching for the word ‘fascist.’ “

Indeed.

A few other gems:

On Katie Couric, in an interview: “Why would I want to talk about her?”

And:
The unfed mind devours itself.
There is no human problem which could not be solved if people would simply do as I advise.
I was born a writer. If you’re born that, you can’t change it. You’re going to do it whether you want to or not.
Any American who is prepared to run for president, should automatically, by definition, be disqualified from ever doing so.

Acid-tongued, an elegant writer, a true character of the 20th century: he will be missed.