Somebody has put up a thread about dice over at the rpg site. It's tongue-in-cheek stuff, but it says something interesting about gamer culture that I've often noticed: The prevalence of dice-related superstitions. Dice are a lot of fun - but at the same time there is a kind of fetishization of the little blighters that I think most of us share; we do not readily understand them (the results of a roll are a mystery - impossible to predict) and that fundamental uncertainty has a bewitching effect. In that respect we are like ancient tribesmen who dream up elaborate explanations for changes in the weather ("It's raining because Snake-on-the-Water cheated on his wife!"), because their true mechanics are unknown and unknowable.
My own superstition about dice is, as I posted in said thread: "When I buy new dice I have to integrate them into the gang by rolling them at least a dozen or so times in different combinations with my older ones. My dice are a team, and I won't tolerate non-team players." When I say 'at least a dozen or so times' I am probably cloaking the true shape of my neurosis - I actually roll my new and old dice together more like fifty times, the very day I buy them. If I don't do this, the new dice might not properly integrate, and this could ruin the chemistry of my dice rolling when it really matters. (If you think that's weird, you should meet my old DM Chris. His dice-superstition was to put his d20s in the freezer for a few hours "as an example to the others" if they consistently turned up poor results.)
I've done this for as long as I can remember. As with most such superstitions it probably got its start due to fluke (I happened to be rolling new and old dice together just before a particularly lucky session), and it is now maintained entirely due to terror. Terror that if I stop, there will be dire consequences for my gaming from now until kingdom come. Granted, I have had lucky and unlucky sessions since the superstition began. But if I stop performing the ritual, it might be the case that I never have a lucky day ever again.
I also believe that dice-related superstitions are one of the only, if not the only, situations in which Pascal's Wager really makes sense. You don't lose anything from such beliefs. Getting on the good side of the dice Gods costs nothing. Of course, you might be wrong; the superstition could be meaningless. But the potential ill-effects if it happens to be true and you ignore it are too terrible to contemplate.