According to a probably apocryphal story about Niels Bohr, a visitor was once astonished to see a horseshoe hanging on the wall of the legendary physicist. "Surely you can't believe in that sort of superstitious nonsense," said the guest.
"Of course I don't believe in it," replied Niels. "But I understand that it works whether you believe it or not." As strange as this story sounds, superstitions in the lab aren't so uncommon. And even more incredibly, they might work. Kind of.