The number 13 is said to be unlucky for some, and when the 13th day of the month falls on a Friday, anyone wishing to avoid an inauspicious event had better stay indoors.

• 对某些人来说，数字13是不吉利的，如果某个月的13号恰巧是星期五，想要避免凶兆的人最好呆在室内。