Not today, rook.

Warriors star Kevin Durant sent that loud message to Clippers rookie Shai Gilgeous-Alexander on Thursday night in Game 3 of their NBA playoff series in Los Angeles.

Our story begins late in the third quarter, with the Warriors winning big, when Gilgeous-Alexander tried to dunk on KD.

Narrator: It was a bad idea.

Durant finished Golden State’s 132-105 win with 38 points and seven assists. He also grabbed four rebounds, one block and one steal.

[RELATED: What we learned from KD, Warriors' dominant Game 3 win]

The lesson: He's Kevin Durant. Don't come after a motivated two-time NBA Finals MVP in the playoffs.