Simon Cowell returned to Britain's Got Talent and immediately left the show's live audience and fellow judge David Walliams gobsmacked as he failed to identify this St George's Cross flag.
The music mogul, 62, has lived stateside for the last two years but failed to recognise the flag of his home country when questioned by a five-year-old.
The youngster called Charles was showcasing his vast knowledge of national flags when Simon was challenged to a showdown.
