Let's put the question to rest: Yes, it is possible to shatter glass with just the sound of your voice.
Mythbusters proved this back in 2005, and many have tested their own vocal cords against the strength of a cup since. And, if you do it right, you too can break glass with your own, natural voice, no amplification or added equipment necessary.
Here's what you need to do:
Still, it usually takes some training to to reach just the right pitch and volume. But, one little kid named Chase decided to try in a video posted to YouTube in 2009...
Wait for it... Wait for it... (Ignore the ridiculously loud bird in the background.)
His reaction at the end is sooo great. "Mom! Look I broke it! I broke a glass!" he yells.
To learn how to accomplish the feat yourself, here's a video with instruction...
In slow motion...
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