Superstitions

I find most superstitions of be extremely silly. Like a black cat walking in front of you, and fearing the number 13. But on the other hand, I catch myself tossing salt over my shoulder when I spill it, avoiding latters, and knocking on wood. I am sure that people would think that my superstitions. But if I don't knock on wood, or though some salt over my shoulder, I feel anxious.