You remove a key and ring from your pocket and explain that your audience will create a three digit number. You ask several people to name a single digit number and these are put together to create a random three digit number.

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'A fresh and original idea from the very clever mind of Marc Oberon' Jeff McBride:   You remove a key and ring from your pocket and explain that your audience will create a three digit number. You ask several people to name a single digit number and these are put together to create a random three digit number.   Amazingly, the number named exactly matches the number digitally printed on the key ring.