Apparently Detroit Pistons center Andre Drummond and Chris Brown play hoops together here in Los Angeles, and the other night the rising NBA star dunked on the R&B singer ... and knocked him flat on the ground.

This was after Brown talked a little bit of smack on the court, but Drummond later tweeted that this was "all planned out" and "just a joke." Still, it had to have been a pretty humbling experience for Chris, who stands nearly a full foot shorter than Drummond.

Glad to see the guys getting along though -- we wouldn't want Breezy picking a fight with someone who could probably pick him up and shoot him across the court!

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