I'm not really a superstitious person. I've stepped on cracks and my mother's back was fine. I've spilled salt many times and nothing bad ever happened. I've walked under ladders and had black cats crossed my path and still had a normal day. So when it comes to Friday the 13th, to me it's just another day.

But how did all these superstitions start? When it comes to Friday the 13th, nobody seems to know for sure how it started, but Popular Mechanics' Magazine found a theory that says it has biblical origins. They believe it is tied to the number of guests at the Last Supper and Jesus' crucifixion on Good Friday.

Another superstition I always thought was stupid is opening an umbrella indoors. Really, the only bad thing that could happen here is you could poke somebody in the eye with the umbrella when you open it. This is another superstition that can't be traced back to a specific origin. According to Popular Mechanics; one theory is that the ancient Egyptians used umbrellas to protect themselves from the sun. So, by opening an umbrella indoors it is considered an insult to the sun god.

Just to be safe you might not want to break any mirrors today. But again, I've broken a mirror or two in my life and I don't remember anything bad coming from it. If you want to learn more about how some of these superstitions got started, check out the article I found on Popular Mechanics' website.