[Gonso]

[ QUOTE ]
You could ask him by what mechanism the coin knows what it's suppose to do according to what happened previously. However he'll probably counter sublimely with more statistical mumbo jumbo and at some point you will probably have to conclude you are arguing with a fool and let it go.

[/ QUOTE ]

Accurate and to the point.

If he doesn't get it, and he really believes in what he's saying, set up some proposition bets. Flip a coin 10 times, then see if he'll lay you $3-to-$2 that he can predict the next flip and the 99 flips after (he's free to make his choice just before the flip).