Who said "Laughter is the best medicine."?

This quote is attributed to Randle McMurphy.

Laughter is the best medicine. - Randle McMurphy

"Laughter is the best medicine."

Randle McMurphy Humor

Character in One Flew Over the Cuckoo's Nest

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"You boys are gonna get a chance to start a new life."

"I'd be happy to oblige you."

"I'm a gambling man."

"I need a little help."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."