The Boston Celtics are going to play against the Philadelphia 76ers in London’s O2 Arena this Thursday night. But as serious as the game might be, there’s still that ounce of playfulness inside the Celtics arsenal.

Everyone knows how good of a high-flyer Jayson Tatum is. But it isn’t only him who’s showcasing one’s dunking prowess, but Jaylen Brown and Terry Rozier as well.

In fact, the Celtics had an impromptu dunk contest while they’re practicing at UK’s capital last Tuesday. The practice’s highlight was Jaylen Brown’s reverse-rotation 360-degree dunk.

Though there were no incentives for this unofficial dunk contest, the No. 3 pick of the 2016 NBA Draft still did his best. Then there’s the almighty Marcus Smart who can’t help but find a way to match Brown’s display of talent.

The Celtics guard wasn’t all about dribbling as he throws down dunks that were easily dismissed as more difficult than Smart’s. Even Terry Rozier had a piece of the dunk show as he showed how good of a dunker he really is.

https://www.instagram.com/p/BdyXaf3h7D4/?taken-by=houseofhighlights

It was indeed a sight to see as the team’s high-flyers burst into the scene without any prior notice. The Celtics are clearly having fun with their practice.

However, this might be an official part of the team’s practice that’s spearheaded by Brad Stevens. Whichever the case is, the face-off between the Celtics and the 76ers this Thursday night will surely be a spectacle to see.

Boston is currently at the no. 1 spot in the East with 33-10, while the 76ers are at the 9th spot with a record of 19-19.