Don’t break a mirror
It is a common belief that breaking a mirror will result in seven years of bad luck. But where did this superstition come from and why seven years?
In Roman times, it was believed that your reflection (in a mirror or in water) represented your soul. If the reflection was distorted (e.g. by the mirror breaking or a stone being thrown into the water), your soul would be distorted too, bringing you bad luck.
The Romans also believed that people’s health changed in 7-year cycles; so after breaking your reflection, you would have 7 years of bad health or misfortune. This bad luck would change when your body regenerated after 7 years