Have superstition ever been proved right?

To me the very nature of a superstition is that they can not be proved one way or the other.

Superstition is "is a belief or notion, not based on reason or knowledge"

Some say it it bad luck to walk under a ladder, this is a superstition.

It might not be a good idea to walk under a ladder, as the person up the ladder might drop something that hits you on the head, but the actual act of walking under that ladder is not in and of itself "unlucky" or "bad" it just carries a very small risk of having something hit you on the head.

It has been my experience that superstitions are a lot like cliches, there has to be (or at least once was) some basis of fact in them or they wouldn't exist, but they are not always right.

Remember some superstition have been around for generations, and life has changed considerably in that time, things that were common practice back then have since been proven to be incorrect... after all people once believed the earth was flat...