It is lucky to knock on wood
Unlucky to walk under a ladder
A Four leaf clover is incredibly lucky
Seven years bad luck if you break a mirror!
Friday the 13th is unlucky, as is the number
"Don't open that umbrella indoors young man!"
Horseshoes are very lucky
Bride and Groom must not meet on the day of the wedding
Unlucky to spill salt
Meeting a black cat is very lucky