A Sensitive Goblet
To fill a glass with water, so that no one may touch it without spilling all the water. Fill a common glass or goblet with water, and place upon it a bit of paper, so as to cover the water and edge of the glass; put the palm of your hand on the paper, and taking hold of the glass with the other, suddenly invert it on a very smooth table, and gently draw out the paper; the water will remain suspended in the glass, and it will be impossible to move the glass without spilling all the water.