Bandleader Reggie Watts has been asking guests weird questions on “The Late Late Show.”

On Thursday he lobbed one at tennis star Venus Williams and unretired NFL star Rob Gronkowski.

But no one prepared Williams — the seven-time Grand Slam winner and sister of Serena — for Watts’ rambling goofiness.

That put the ball back in the court of a confused Williams, who shook her head and asked, “Is that a question?”

Watts gave both Gronkowski and Williams credit for a correct answer.