I grew up in an Irish-Native American home just rife with superstitions. I don't really hold to those anymore (I don't believe that hat placed on a table or bed is bad luck, but it is just plain rude) but I have picked up one or two on my own over the years. The one that I hold to the most is that I NEVER use soap on my coffee cup, travel mug, or thermos. It ruins the taste of the coffee.
What kitchen superstitions do you hold to?