Richard Jefferson gets ball thrown at him after dunk

Richard Jefferson is approximately 54 years old (just kidding, he's 36), but he can still dunk. It just didn't seem like the Celtics' Terry Rozier appreciated such a spectacular feat of athleticism.

During the second quarter of the Cavaliers' game against the Celtics, Jefferson soared for an alley-oop dunk courtesy of LeBron James.

Jefferson swung on the rim for a bit and went over Rozier, who really wasn't a fan. Rozier responded by chucking the ball at Jefferson.

Rozier was hit with a technical because throwing basketballs at people is not cool. Sportsmanship matters.