Mike Tindall, the former rugby star and husband of the Queen's granddaughter Zara, has revealed quite the amusing story about Prince Harry at a sports event in London.

Mike Tindall tells funny Prince Harry anecdotes

On "A Question Of Sport Live", Mike Tindall spoke about a night in Sydney in 2003 when he celebrated England's victory in the Rugby World Cup and met the prince while drunk.

At that time, he and his teammate Iain Balshaw had the great idea of testing the royal security. So they slapped the Queen's grandson to see how long it would take for the bodyguards to swarm them — just a few seconds, it turned out.

Mike Tindall jokes Royal Family wants to slap Harry today

Tindall also made a rather interesting joke afterwards: that the Royal Family currently wants to do the same with Harry!

"At Balmoral, the family are now having the same conversation. Except the Queen has taken his security away," Mike joked, according to the Metro.

Mike Tindall and Zara Phillips at the wedding of Duchess Meghan and Prince Harry

Mike Tindall thus confirms — albeit with a wink — that Prince Harry has made himself somewhat unpopular with his relatives due after his interviews about life with the royals.