The kinda walk under ladders/cross on stairs/black cat superstition? No i dont. But i know somebody who wont have anything to do with the number 13. He refuses to even think about it, let alone mention it. Last time i brought it up he started chasing me shouting at me to shut up!
No, id leave it at that there but theres a minimum word limit so ill add. Superstition is for simple minded people that need to make up something to explain what they cant comphrehend, much like religions.