Thorns, yes I've always said that in another way, i.e. most systems work SOME of the time.

I have a mate that plays the Martingdale (spelling?) at the casino, he waits for a losing run of 6 (black or red) then steps in. I've given up trying to explain that the 7th spin is still 50/50 but he wont have it, he does seem to win all the time, but he will get cleaned out one of these days. (won't he?)