Doing some research I found
this:
I need /dev/kmem to play kmem Russian roulette:
2 or more players do execute "dd if=/dev/urandom of=/dev/kmem bs=1 count=1 seek=$RANDOM" successively. The one who crashes the computer has to make a beer run, brew coffee or whatever you like.
It's a funny game for geeks, but don't do that on production systems ;-)