20 terrible things that happened on Friday the 13th

Costa Concordia capsized.

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• February 13 is a Friday.
• Friday the 13th has been a superstitious date for a very long time, but no one knows exactly why.
• There are multiple examples of terrible or tragic events happening on these Fridays in history.

Friday the 13th is so famously unlucky that there's even a phobia dedicated to it: friggatriskaidekaphobia.

Even if you personally don't put stock in this fear, there are a lot of people who do.