in 3?

[Iqra]

Wa'alaykum Asalaam Wrora.

You answered your own question.. it's nothing more than superstition.. (which is haraam).

Yeah I understand that, but I guess I first wondered if it truly was a superstition or if there was another reason or something ...

Also, I wondered if anyone knew the story about why this came to be, but I guess the best reasons would be to combine (or not combine) superstition with psychological reasonings.