If you are superstitious, which ones do you follow/try to avoid?

I'm not really all that superstitious, but it comes with my upbringing. My mom has always been very superstitious, and Sweden is a country with many stories like these. The only one I can think of that I do follow is the "don't walk under a ladder" one, mainly cause I'm afraid it'll fall down and squish me

It's funny to see how many superstitions come from religion, for example the ladder one comes from the early Christian belief that a leaning ladder formed a triangle with the wall and ground. And you must never violate the Holy Trinity by walking through a triangle, if you did you were considered to be in league with the devil (and we all know what Christians did to people they suspected of that). And the "spit if you see a black cat" one (my most hates superstition) comes from ancient Egypt, where the Goddess Bast, was a black female cat. Christian priests wanted to wipe out all traces of other religions so preached to their followers to destroy the evil demons that were black cats. While they were at it, they destroyed the kindly little old ladies who cared for the cats believing them to be witches.

I find things like this so very interesting!