What are some superstitions you believe are true?

I tend to knock on wood when I'm in situations like "GOD FORBID THAT WOULD HAPPEN".

Also, i think when you get the random shivers that a ghost passes through you.

Another big one, for my people is promaja. I don't believe in this and I think it's really silly, but basically it's that you get sick from draft. Basic things like opening 2 windows at once, or having your car windows down. Going outside with wet hair etc (and that you get body aches because of the draft)