MORE: How to play with Simmons, other rookies in ‘2K’ The incident happened at a clinic hosted by the Celtics at a community center in Roxbury, Mass. After giving out lessons on dribbling and other fundamental skills, Brown found one more teaching moment for the young man.

MORE: Draft grades | Winners and losers “He challenged me and I just blacked out. He said, ‘You ain’t good,” Brown told MassLive.com. “He said Ben Simmons is better. So I said, ‘All right, OK.’”

Brown crossed over the kid, who gave up at least 2 feet to the 6-7 19-year-old, and then went past him for the dunk. If he’s as good at making NBA players eat their words as he is against middle-schoolers, the Celtics may just have themselves a player.