We know now that these rats were the true culprits of the plague, and most unfortunately, the killing of cats in these towns made the plague worse as the rat population would then run out of control.
This assumption even came up in the infamous Salem witch trials, where owning a black cat was seen as evidence against a person suspected of witchcraft.
In some cultures, people believed, and in some cases still do believe, that a mirror could steal a person’s soul.
The three sides make a triangle: the Father, the Son, and the Holy Ghost.
Throwing salt over your shoulder: In ancient and classical societies, salt was a very valuable commodity, so spilling salt was a major waste of a valuable resource and of money.