I've done so with a guitar. You need a high quality glass. You also need to know the frequency of the glass. Wet your finger, rub it around the rim until it "sings". Hit that note as loud as you can, and the glass will shatter.
i broke a glass with my voice once... got nervous and yelled at my younger brother... he dropped the glass he was drinking from (does that count)
Ever heard a car go by with a bunch of ghetto trash in it and suddenly it hits a bass note that makes EVERYTHING in your house shake? That's its resonant frequency.
supposedly a few of the bigget pyramids are the same freq. as the earths core, but I don't know how one would go about figuring that out running a wet finger along the edge of a wine glass causes the freq. to be audible...