“Insanity is a very high art form. If everyone was insane, I wouldn’t be here!”
The Stage, January 2007 https://www.thestage.co.uk/opinion/2014/remembering-rik-mayall-one-oddest-fun-interviews-ive-ever-done/
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Rik Mayall 6
British comedian and actor 1958–2014Related quotes

“There's no way I can stop writing, it's a form of insanity.”
Source: Women

“Genius is one of the many forms of insanity.”
As quoted in Born under Saturn: the character and conduct of artists : a documented history from antiquity to the French Revolution (1963) by Margot Wittkower.
“One form of insanity bears the name curiosity.”
Source: The Heritage Universe, Convergence (1997), Chapter 18 (p. 433)

As quoted in Words from the Wise : Over 6,000 of the Smartest Things Ever Said (2007) by Rosemarie Jarski, p. 312. From The Praise of Folly.

“Falling in love is kind of like a form of socially acceptable insanity.”
Source: her

“Everybody's youth is a dream, a form of chemical madness.'
'How pleasant then to be insane!”
Variant: Youth is a dream, a form of chemical madness.
Source: The Diamond as Big as the Ritz, and Other Stories

De Abaitua interview (1998)
Context: I can understand why magicians have such a high insanity rate. We don’t end well, most of us, it has to be said. Paul Daniels might escape the worst effects, but the rest of us are pretty obviously doomed. Once you step over that line, you are in danger from a lot of stuff. Delusion, obviously, being the main thing.