What culturally-based obscure facts or myths do you know of concerning what people do with hair that has been cut off of heads?

It's a tradition from the maternal side my family that we save the hair from a boy's first haircut so that he will be intelligent when he grows up.  I do not know its origin, but I swear by it because my mother did it with me and I carried on the tradition with both of my sons. To this day, tucked away somewhere in little plastic bags are tufts of their rich dark hair. Unfortunately, I do not know if it was/is also practiced with girls. I only have sons. 



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