Here's a preview of what the NBA All-Star game's gonna look like in a few years ... Bronny James throwing some of ferocious dunks while messing around with Shareef O'Neal!
The whole thing went down at LeBron James' Brentwood mansion -- where Shaq's sons Shareef and Shaqir rolled over for a shootaround with Bronny and some other friends, including Syracuse recruit Dior Johnson (one of the best high school players in the country).
LeBron was so impressed he whipped out his phone and started shooting video ... and it's pretty great.
Shareef seems to be doing REALLY well after heart surgery earlier this year.