Although members of the Royal Family are highly familiar with etiquette and protocol, they're still human after all. Prince William once suffered an "embarrassing" moment when attending the annual Diplomatic Corps reception at Buckingham Palace—but luckily for the Prince of Wales, Queen Elizabeth actually loved it when things went wrong at royal events.
In 2016, a special documentary called Our Queen at Ninety was released by ITV in honor of Queen Elizabeth's 90th birthday. In the program, members of the Royal Family, including Prince William, shared their favorite memories of the late monarch.
