A family was filming these Silverback gorillas at a Nebraska zoo when one of them suddenly got aggressive.

How many times have you been to the zoo and stood behind that glass, wondering if it's strong enough to resist the brute strength of the animals inside? Well, wonder no more! It is not!

This video was taken at the Henry Doorley Zoo in Omaha, Nebraska. At the beginning of the video, you can see the little girl beating her chest at the animals, which is probably what enraged the one who attacked. I bet she won't be trying that again. Also, if you freeze the video at the right moment, you can see the family's terrified reaction reflected in the glass:

They're actually pretty composed, considering the circumstances.(via YouTube)

Personally, I've always been more afraid that this will happen at the aquarium. Can you imagine? I can and do in my nightmares.