Dillon Brooks will Dillon Brooks!
The Houston Rockets' newest offseason addition is already seeing to it that his paycheck is a little bit lighter ... the NBA fined the guard/forward $25k for hitting Pacers' player Daniel Theis where the sun don't shine.
The league announced their punishment on Thursday, two days after Brooks took a cheap shot in the first few minutes of the Rockets' 122-103 win over the Pacers in a preseason game on Oct. 10.
The whole thing was caught on the live broadcast .