A Spring day at John Ball Park Zoo was ruined after a chimpanzee with accurate aim pelts grandmother with poop.

Jacob Mitchell via YouTube

This matriarch found out just how mischievous chimpanzees can be as gram gram got hit in the face with poo poo at Grand Rapids' John Ball Park Zoo.

A YouTube video posted April 2 shows a chimpanzee swaying back and forth watching the crowd watch him. As the hooting and hollering increased, the chimp flung feces at the crowd, hitting a grandmother square in the face. Watch as a giggling onlooker exclaims "it got grandma!"

Bonus Video: Exploring the Lillian Anderson Arboretum