Nuggets forward Kenyon Martin was upset after an April Fool's Day joke was played on him Thursday.
During Denver's win over Portland, a former Nuggets ball boy got into the club's locker room and took Martin's car keys. He then filled the player's Range Rover with buttered popcorn.
Martin discovered the damage as he was about to exit Denver's Pepsi Center.
Angered, he went back to the locker room spewing profanities and threats at teammates and other members of the organization.
"That ain't no [expletive] joke," Martin said. "I'm going to find out who did it ... put my [expletive] hands on one of y'all. I'm going to put my hands on whoever did it. You better believe that. It's [expletive] personal. You better believe it."
Martin, who has missed 15 games with a torn patella tendon in his left knee, threatened to boycott the postseason if he did not find out who was responsible.
"How 'bout if I don't play in the playoffs until somebody tells me who did it," Martin said.