“He told one British journalist that ‘conversations with two friends…influenced me. Each of them had been wounded in the war, one of them very seriously The first one told some very funny stories about his war experiences, but the second one was unable to understand how any humour could be associated with the horror of war. They didn’t know each other and I tried to explain the first one’s point of view to the second. He recognized that traditionally there had been lots of graveyard humour, but he could not reconcile it with what he had seen of war. It was after that discussion that the opening of Catch-22 and many incidents in it came to me.‘”
By way of Ed Champion at Reluctant Habits, Joseph Heller biographer Tracy Daugherty recounts the origins of Catch-22 in Vanity Fair. “I’ve got the perfect number. Twenty-two, it’s funnier than eighteen.“