You fill up a glass with water, cover it with a piece of paper, turn the whole thing upside down, let go with your hand and the paper and the water stays! Thats physics! No over to magic: take away the paper and the water stays suspended inside the glass ... and the magic finale: you snap your fingers and the water comes out of the glass and hopefully lands in the bucket on the floor. This is a surefire effect, with which I often end my shows. Nice full size glass in unbreakable plastic.