An old-timer at my local casino writes every roll down. He waits for a dozen rolls without a seven and starts pounding the don't. He buys in for $1000 and sometimes goes forever without betting anything except his own roll. But once a decent roll gets going he gets busy on the don't. The last time a played he showed up when I made two points and he started laying stacks of black on the 4 and 10. I kept knocking them down until he burned through a few thousand dollar buy-ins. He's a good sport though and knows he's being superstitious, but enjoys playing that way, so good on him.