I don't believe in superstition. Friday the 13th is just antoher day (and a basis for all those horrible Horror films like the 80's... in fact most of the movies from teh 80's were horrible IMHO!)
But... if you think about the... the walking under a ladder is kind of relevent. There's some dude on top of the ladder, it slips and the ladder comes crashing down on you.
OMNI: the black cat superstitious is the most ridiculous. They are very nice cats (all cats are purrfect in my view) and the horrible thing is around Halloween so many cruel people torture and kill these poor cats who did nothing except being born with the wrong color. IT's sad.
I took a black cat in for about 3 weeks one Halloween. The poor thing has paint on it and was kicked. (Yaz and Cleo welcoemd the cat to my surprise) I paid for its medical bills and when a friend's cat died this "Miracle" (that's teh cat name) went ot live with the friend and never had to worry again about being tortured.