Chris Rock ended a set early because someone broke the rules.

According to Page Six, Rock performed at billionaire Anthony Pratt’s Christmas party over the weekend.

During his act, Rock noticed something in the crowd that upset him.

A witness relayed with Rock said: “He wasn’t supposed to be taped, videoed, or reported.”

Rock then “[barreled] quickly, forcefully, through people to the exit doors.” He didn’t return.

The comedian has not discussed what ticked him off.