Well everyone knows about knocking wood, but if there is no wood around I knock on my head and find it works too.
For some reason putting a new pair of shoes on the table even though they were still in the box would cause my aunt to call down all the saints, "Jesus, Marry and Joseph being the most prominent and often used.
Still have a hard time stepping on a crack and always look to see if a penny was head up or tails.
Some made sense then others, like not walking under a ladder vs breaking a mirror giving 7 yrs bad luck.
