Prince Harry, the Duke of Sussex and the former third in line to the British royal throne, has revealed in his new memoir, Spare, that he once called in a pretend airstrike—on his own father, King Charles.

Back when Harry was in military training in the late 2000s, he put his skills to work on then-Prince Charles, now the King of England, sending an RAF Typhoon to track him. Harry retasked the fighter to target a nearby barn instead, pretending to blow it to smithereens.

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According to Prince Harry’s revelations in Spare, the incident took place in the late 2000s before Harry’s deployment to Afghanistan. All men in the Royal Family traditionally volunteer for the British armed forces as a way of serving the country. While most become naval officers or airmen, Harry joined the British Army instead.

Read more: Popular Mechanics