Chat: What superstitions do you have?
Friday 13th is considered by many superstitious people to be the unluckiest day.
But do you believe that? Do you behave differently when the date comes around?
What other superstitions do you have? Do you refuse to walk under ladders or are you worried about bad luck if you break a mirror?
And what about if a black cat crosses your path?
Or do you not believe any of it, and think superstitions are rubbish?
Here's a few of your comments...
"I was born on Friday 13th August, two days after a solar eclipse. I wouldn't be able to live if I was superstitious!"
Helen, 12, Hampshire, England
"I don't think Friday the 13th is unlucky because my friend had her birthday party on Friday the 13th last year and it went really well!"
Crystal, 11, Bristol, England
"I think it's unlucky because I fell over twice today and may have broken my ankle."
Emma, 12, Birmingham, England
"I think one superstition is putting shoes on the table! My mum, my gran and even my teacher agree with this one!"
Amy, 10, Manchester, England
"I don't really believe in superstitions but the number 6, my lucky number, always pops up EVERYWHERE! It's weird but it always makes me smile."
Elena, 13, Belgium
"I don't have any superstitions. I think if you think something is going to happen it probably increases the chances it will!"
Emily, 10, Maidstone, England
"I was born on my dad's birthday, Friday the 13th, so I don't believe that it's unlucky really. I don't believe in superstitions, I'm always lucky if a black cat crosses my path!"
Vicki, 13, Bristol, England