Personally, I would consider a redheaded woman that came knocking on my door to be
most fortuitous.

Hey, Mal! Come'n give me some luck.
On the other hand, we, at the O'Rights household, hold to tradition that it is good luck to eat a hearty meal of pork roast and sauerkraut. (O'Rights being a fine and respected family name in Bavaria) Fortunately...I happen to like pork and sauerkraut.