I know what you are thinking “What the heck is with the title and the video?” If not you can still read this but it is about hearing not drinking wine and throwing a crazy party O.K.? So to explain, fist off the wine glasses move making the sound and the note of the wine glass. The less water the higher the note of the wine glass. It is actually the resonance of the wine glass and another thing the less the water the louder the note of the wine glass. When it makes the sound it is actually moving the rim of the wine glass. If you hit the wine glass with  the right amount of noise and just the right pitch the wine glass will shatter.