Actually, I went my entire Junior year of varsity football without washing my socks out of "superstition". We didn't win much, but I enjoyed the notoriety.
And, being what I like to consider a spiritual being, I must acknowledge the spiritual power behind black magic, white magic, voodoo and of course, Stevie Nicks.
Yahweh also acknowledged the spiritual power behind the "darker arts", and therefore gave magic the death penalty. For an Old Testament Jew, practicing magic meant a stoning.