Funny Shark Prank Demonstrates Why You NEVER Tap The Glass! [Video]

At aquariums, there are always signs posted saying "don't tap the glass!" Maybe this Grandma should have read the sign.

This shark "attack" would give anyone a scare, not to mention a sweet unsuspecting Grandma like this woman.

Watch as she taps on the glass of a virtual interactive shark attack display at the The International Spy Museum in Washington, D.C. Her reaction is priceless!