Prince William was on call to fly the East Anglian Air Ambulance helicopter when they got a call about an emergency, according to the Daily Mail.
The prince flew the helicopter to a home in Cambridgeshire, England, where a man in his 80s had suffered a heart attack.
The man, who is now recovering, told the Daily Mail the prince was perfectly pleasant.
“My wife, Tasha, was over the moon, because she loves the Royals,” the man told the Daily Mail.
The prince has been flying the air ambulance since last year. He is paid for his services, but he donates the money to charity.