supersitions

I'm Piero. An Italian superstition is that the black cat is unlucky if it passes in front of you.
The number 17 is also unlucky, while number 13 is lucky.
A charm with horns that look tawards the floor can protect you against bad luck.
My parents are from Naplesand in that wandeful city people are very supersitions.
wthe do yuo think ? Have you got other strange curiosities?