A gorilla nearly smashed through the glass of its enclosure after being taunted by a little girl at the zoo.
The girl and her family were visiting two silverbacks at the Henry Doorley Zoo in Omaha, NE.
She cheerfully beat her chest at one of the apes, probably thinking it was a harmless way to say "hello."
But the true meaning of this gesture is to exude dominance.
The gorilla subsequently charged at the girl and threw itself at the window so violently that it cracked.
Video of the terrifying experience was captured by Reddit user bulldogg9279, who wrote,
Shortly before this we were telling the kids they could not break it. They will never believe us again. Sadly the one beating her chest really started crying. I came back a couple of minutes later, and the zoo keepers were telling people to stay away.
In the seconds before the attack, you can scarcely hear the girl's brother telling her "don't do that," and then what sounds like "it's really bad to do that."