The idea about Friday the Thirteenth is totally ridiculous. I don't believe it at all.
Maybe you can't be so sure.
Why not? The whole idea is superstitious. But some people use this occasion to create trouble. Have you heard of the Black Friday Virus on the computer? It is designed to break out on every Friday the Thirteenth.
I know that. But that has nothing to do with being unlucky. Those who created the virus are deliberately making fun of people.