A Man, Breaking glass with his voice

Mr. Jaime Vendera can break glass with his voice. "I don't feel special. I have been taught to do this. One of my friends, Jim Gillette of rock band Nitro, used to break wine glasses with the help of the amplifier and he was the one who taught me to do this," Vendera, 42, told IANS on phone from Ohio.
During Mythbusters' program (Discovery channel, 2005), they measured Jaime's voice and found that it is more louder than others. So they asked him to break a glass with his voice, from that moment to till now he work hard to achieve that.
But it is not recommended  for others because it may cause damage to vocal cord.