Mike Tindall once punched Prince Harry after one too many drinks in a prank gone wrong.
The rugby star is married to the royal's cousin Zara, and the two really got to know Harry well after hanging out at the tournament he was playing in back in 2003.
The group were celebrating England's historic world cup win in Australia, as Mike and his pal decided to play a violent prank on the Prince.
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, writes the Mirror.
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 giving 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."
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.
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.
Get the latest celebrity gossip and telly news sent straight to your inbox. Sign up to our weekly Showbiz newsletter here .
