This woman knocks on the shark tank glass. At 0:15 she learns a hard lesson

Don't touch!

Warning! People with weak nerves should be careful when watching this video.

This woman walked up to a shark tank and started touching the glass. What happened next nearly scared her to death:

Upon closer inspection it's clear that this is an animated screen and not a real aquarium. But it's a very effective way to teach people an important lesson: when visiting a real aquarium, don't tap or knock on the glass. The animals in these tanks are sometimes very stressed and there's no way of knowing how they will react!