If you've ever visited the gorilla enclosure at a zoo you'd be forgiven for assuming that big thick bit of glass between you and them was strong enough to keep you safe.
Well this clip may make you think again.
This incredible footage shows a young girl at Henry Doorly Zoo in Omaha, Nebraska, beating her chest while observing the primates.
Unfortunately Kigito the Silverback doesn't seem particularly impressed and suddenly charges the glass, cracking it as the shocked family look on.
Officials at the zoo have insisted the family were not in danger at any point.