"Eli's Box" a small box that holds several dice. The box is shaken, and the outcome can be controlled by you.
Predictions can be made. Card tricks can be performed. Book Tests can easily be created. The list goes on!
And it's almost self-working.
Here's just one of many possibilities.
A box is introduced and shaken. You audience can hear the dice rattling around. The box is opened and the top numbers are added together and written on a pad.
The dice are freely rolled on the table by a helper and the top three numbers are added together, that total being written on the pad as well.
The dice are then placed back into the box, which is vigorously shaken. It is opened, and the top three numbers are added together and recorded on the pad.
All three of these randomly generated numbers are then added together.
You can then reveal you predicted that exact total.
And everything is completely examinable!