The incident reportedly occurred after the King visited a mental asylum and met an individual who believed he was the true Prince of Wales.
In his book, Spare, Harry attempted to shed light on the incident and described how his father enjoyed telling the story.
He claimed that the King wagged his finger at the patient and said, "Let's see, you can't be the Prince of Wales, I am the Prince of Wales." The man apparently responded to the King with a similar gesture.
According to Harry, his father then joked about the possibility that he might not be Harry's "real father." He allegedly said, "Who knows if I'm even your real father?
Perhaps your father really is in Broadmoor, my dear son!" This joke reportedly came at a time when rumors were circulating that Harry's true father was Major James Hewitt.
Harry described the joke as "remarkably unfunny" given the rumors circulating at the time. He noted that his father would laugh and laugh, despite the poor taste of the joke.
