I don't BELIEVE any superstition, but using the same principle as Pascall's Wager, I don't walk under ladders, I avoid black cats, I whistle when I see a magpie, I'm particularly careful on Friday 13th, I avoid the number 13 generally, I NEVER step on the cracks in pavements (sidewalks) when in London (tho' fortunately I don't go there that much any more, and outside London of course it doesn't apply), I always throw salt when I spill it, I never put the sugar in before the milk when I'm making tea, and most importantly, I always make sure I'm out of the bathroom before the flush stops.