There's sporting rivalry and then there's this.
Prince Harry is obviously front and centre of Invictus Games promotion but in this video he's managed to get his grandmother, y'know THE QUEEN, to help him out.
The video starts with Harry showing a brochure about the games to Her Majesty.
-- Kensington Palace (@KensingtonRoyal) April 29, 2016
But the conversation is interrupted by Harry getting a text message from Michelle Obama.
Obviously she's saved in Harry's phone as F.L.O.T.U.S.
Cue a video message from Michelle with her husband US president Barack Obama.
"Hey, Prince Harry," says Michelle. "Remember when you told us to 'bring it' at the Invictus Games?"
The president then cuts in: "Be careful what you wish for." As he points to the camera.
-- The First Lady (@FLOTUS) April 29, 2016
The same video message was earlier shared on Michelle Obama's Twitter account.
In the background, distinguished military personnel then drop a "boom bomb".
Back in the UK, the Queen then says: "Oh really, please", while looking ever so proudly at her grandson.
He then looks to camera and drops his own "boom bomb" - in a style which says 1-0 to the UK.
Or as Harry declared via the Kensington Palace Twitter account: "Unfortunately for you @FLOTUS and @POTUS I wasn't alone why you sent me that video." He signs off with a winking emoji and "-H".
Boom indeed. Is it better than when the Queen "parachuted" into the Olympic game opening ceremony with James Bond? It's up there.
The Invictus Games runs from May 8-12 in Orlando.