Do you believe in any superstitions, even if you know they might not be rational?

I don\'t believe in all superstitions, but I do believe in some superstitions that I know may not be rational. For example, it is a myth that you don\'t eat seaweed soup on days when you have an important test. Seaweed is slippery, so it ruins the important test or fails. There are many unpredictable factors in the important test, but the biggest factor is psychological factor. I think psychological factor affects in the important test. It\'s really ridiculous superstition, but people have a desire to rely on it sometimes. So, reducing psychological anxiety may lead to better results.