Why did i break a glass of water without touching it?

I work as a bartender and one day when we were cleaning up i went to catch an empty glass of water which was in normal temperature dry and just sitting there just when my pointer finger reached about 1/2 cm from the edge of the glass the glass exploded,not just broken, like you have shot it with a gun.
I noticed that my hand was loose and my mind clear.I heard somewhere for mind power but it happened accidently and i don’t know for sure or specific things.I want to know what does this means why it happened accidently and if i can do it again.