“I think our society is run by insane people for insane objectives... I think we’re being run by maniacs for maniacal ends, you know... I’d be very pleased to know what they think they’re doing. I think they’re all insane. But I am liable to be put away as insane for expressing that, you know. That’s what is insane about it.”

"What Can I Tell You about Myself which You Have Not Already Found Out from Those Who Do Not Lie?" in The Beatles Anthology (2000)
Context: Our society is run by insane people for insane objectives. … I think we're being run by maniacs for maniacal ends and I think I'm liable to be put away as insane for expressing that. That's what's insane about it.

Source: Daemon (2006), Chapter 45: Respawning, Character: Laney Price
Context: You know, the average Chinese factory worker must think Americans are insane. Picture this: you work at a plant that makes Halloween stuff—you know, like, rubber severed heads. And you're all like: Americans decorate their homes with severed heads? These fuckers are savages, man.

Source: Last Sacrifice

Source: Monstrous Regiment

Loving What Is: Four Questions That Can Change Your Life (2002)

Deconstructing Harry (1997)

As quoted in "Heller's legacy will be 'Catch-22' ideas" at CNN (13 December 1999) http://archives.cnn.com/1999/books/news/12/13/heller/index.html

On Fresh Air with Terry Gross, promoting Fierce Creatures, which Cleese says is a satire about Rupert Murdoch's greed. (1997)