How To Stack Dice With One Hand

Take some large dice, preferably 19mm casino dice, and a plastic cup, making sure its sides are not too steep.
Hold the cup between 2 fingers and thumb, quite close to its mouth. Scoop the first dice up by coming at it from the side at speed. Continue to swing your arm from side to side so that the momentum pins it to the bottom of the cup.
Continue the above motion along a line of four dice, and once they are all in the cup, slide it along the table and bring it to a sudden halt. Move the cup slightly, and lift it up to reveal the dice stack which has formed.