Get him to tell you about "blindfold chess", where you play multiple opponents on separate boards simultaneously, while blindfolded... /grin
On business trips I play my boss while driving. I drive, he has the magnetic travel board. We both announce our moves. I can't look at the board. I've won 5/6. We got into a heavy rainstorm and he beat me. I just couldn't hold the position in my head that time.
It blows him away when I catch him in an illegal move.