Show to your audience a black die inside a transparent case. Shake the case and instantly, without any cover or suspicious move, the die will explode turning into 8 white tiny dice! All in front of the astonished spectators.
Also, the die can be transformed into many coins, small balls, a sugar cube, etc.
With this set another routine is also possible, which raises the level of magic and mystery in the effect. Here it follows: show the black die inside the transparent case. Let a spectator choose a die among three of different colors. Now shake the case and instantly the black die will change its color into the same one of the chosen die!