People who, when quoted, instantly invalidate any argument

A list, in no particular order and of no particular completeness.

• Noam Chomsky
• Ayn Rand
• Gandhi
• Winston Churchill
• Hunter S Thompson
• Pope John Paul II
• Jim Morrison
• George W Bush
• Milton Freedman
• Timothy Leary
• Adolph Hitler (by way of comparison)
• Dr Seuss
• Frederic Nietzsche
• any DJ other than John Peel
• Richard Stallman
• Ann Coulter
• Bill Watterson
• Richard Dawkins
• any anthropomorphized animal character
• Strom Thurmond
• John Lennon
• Karl Marx
• Adolf Eichman
• Anton LaVey
• Jerry Falwell
• any baseball personality
• Aleister Crowley
• Carlos Casteneda
• Einstein (if not about physics)
• Deepak Chopra
• William Randolph Hearst
• Bobby Fischer
• anyone with a blog
• L. Ron Hubbard
• William Shakespeare
• Robert Anton Wilson
• Mark Twain
• Bono, or anyone Bono would quote

Compiled in part from suggestions.