break a mirror

superstition that indicates that if a mirror breaks it is synonymous with being seven years of bad luck is only a consequence of a precise historical moment, located in Venice ,mirrors in ancient times and today in some families it is still a bad thing because before these mirrors had to be cleaned by slaves so that if it broke bad luck or them.  seven years of bad luck waiting for the person who broke it brought misfortune and tragedy. It is also said that in order to protect children, they are not allowed to see or look in a mirror before the age of one, as they could become traumatized, not believe properly or die in that period.

To cross fingers

It could be an ancient pagan custom, since it was believed that the wishes were kept at the point where the fingers crossed, the good spirits meeting there until those wishes finally came true.  This would try to attract good energy.
It is also a bit of bad luck in some religions, so it is associated with the Chris