An American scientist once visited the offices of the great Nobel prize-winning scientist, Niels Bohr, in Copenhagen, and was amazed to find that over his desk was a horseshoe, securely nailed to the wall, with the open end up in the approved manner (so it would catch the good luck and not let it spill out).
The American said with a nervous laugh,
"Surely you don't believe the horseshoe will bring you luck, Professor Bohr? After all, a famous and level-headed scientist--"
Bohr replied, "I believe no such thing. Not at all. I am scarcely likely to believe in such nonsense. However, I am told that a horseshoe will bring you good luck whether you believe in it or not."
--------------- A Final Thought ...
"In short, Luck’s always to blame."
- Jean de La Fontaine (1621-95), French poet, fabulist. Moral of fable, “La Fortune et le Jeune Enfant"