Can you break a glass with your voice? It's difficult, but Wikihow can show you the way.
Plug in your amplifier, and follow these steps:
Put on safety goggles and ear protection.
Plug your microphone into your amplifier.
Turn on your microphone and turn the volume on your amplifier to max.
Place a crystal glass right in front of the amplifier.
Tap the glass and listen carefully. Make note of this pitch and use it as a starting point in the next step.
Sing several different high notes into the microphone until you hit the right one for that specific glass, at which point the glass will shatter.
Regular technovelgy reader Adi was unable to resist pointing this one out, since he covets the weirding module from the movie made from Frank Herbert's novel Dune.
In the film, director David Lynch decided to have a special device that would turn Fremen leader's spoken name "Muad'Dib" into a weapon. This device does not appear in the book. A picture of it is provided below.
I couldn't find a copy of the original commercial, but I invite all older readers to join me in repeating that magic phrase "Is it live, or is it Memorex?" after listening to the incomparable Ella Fitzgerald. (Younger readers will see the connection at the end of the short video.)