What old wive's tale(s) do or did you take seriously, wonder if you'd best stop and think first, accept without knowing why or say copied from your mother or father etc.... ?
Mother who was always very superstitous and the youngest of three children was always throwing salt over her shoulder yet when asked why because her mother always did. She never opened an umbrella indoors, had a thing about cats and midnight and I must never cross my eyes in case they stayed that way. Thankfully I've forgotten the rest as they were too neurotic.
As for Halloween and Friday the 13th....