Mike Tindall once attacked Prince Harry after a few too many celebratory drinks in a bizarre prank.
But the royal didn't seem to mind that the powerful rugby star and his pal were launching into him - England had just won the World Cup.
The former Red Roses centre, married to Harry’s cousin Zara, really got to know the Duke of Sussex at the tournament he was playing in back in 2003.
But after celebrating the historic moment in Australia nearly 20 years ago, everyone involved seemed to make the most of it.
Though things got a little out of hand hours after drop-kick hero Jonny Wilkinson sent England into dreamland Down Under against their old rivals.
Tindall and team-mate Iain Balshaw decided to test just how good Harry's security really were.
They decided to see if his team would jump in even if, say, if two huge rugby players were gaving him a few slaps.
The pair decided to carry the plan out to see how quickly staff would intervene.
But the pesky pair soon discovered his bodyguards are actually pretty fast and couldn't care less if you've just won the World Cup.
They soon learned that it would only take a few seconds for Harry's security to pin them to the ground and give them a serious talking to.
Tindall spoke about the playful incident on a podcast with England star James Haskell.
While discussing how he could be depicted in Netflix drama The Crown, he said on the show: "That has to be the main incident, if it was there — the full Harry slap."
Then, seemingly referencing Harry's issues with the royal family since leaving the UK, he joked that it's not only the producers who should grab a piece of the action.
"At Balmoral, the family are now having the same conversation," he teased.
"Except the Queen has taken his security away."
The high jinks doesn't end there - Tindall reportedly branded Harry a 'b***end' during the Platinum Jubilee celebrations.
It comes as Tindall called Prince Harry a "b***end" during the Queen's Platinum Jubilee celebrations.
A source overheard the former English rugby player referring to the Duke of Sussex's behaviour as that of a "b***end".
Harry and wife Meghan Markle didn't attend the event - or any other celebrations publicly - apart from a thanksgiving service at St Paul's cathedral the day before.
The couple stayed low-key during the four days of celebrations - but it seems like their antics caused drama behind the scenes.
