Weird superstitions I've had as long as I can remember
These aren't necessarily things I entirely believe, but they are things that I catch myself thinking about out of nowhere.
Don't stay in a dark room for too long, especially with your back turned
Don't look haunted objects (specifically dolls) in the eyes or they can see you too.
Don't look into mirrors when it's dark, especially full body ones.
If someone gives you something, do not break it or it could hurt them physically somehow (losing things is fine).
Keep your windows covered at night.
Trust dogs when they dislike someone. Cats especially.
Cats can see the dead or unknown.
Pictures of people are more like a window. (ie: Posters can see you.)
Don't stay too close to the space under your bed at night when it's dark.
There's something spiritual about water, not dangerous, but definitely something.
I'll add more later, or you can add your own.