Watch: Gorilla with zero chill pounds on glass, moons zoo visitors

ST. PAUL, Minn., May 23 (UPI) -- A visitor to a Minnesota zoo captured footage of a particularly grumpy gorilla pounding on the glass before flashing his derriere toward the visitors.

The video, posted to YouTube by user LuckyChameleon, shows a gorilla at the Como Park Zoo in St. Paul showing his apparent annoyance with a loud group of human visitors last month.

The gorilla pounds on the glass, eliciting excited laughter from onlookers.

The primate, apparently unhappy with this reaction, then turns around and bends over, giving visitors a good look at his full moon.