Welcome back! Slavoj Zizek's Niels Bohr joke continues... A fellow scientist, upon arrival at his friend Niels Bohr's house, was surprised at seeing a horseshoe above the door of Bohr's country house. The visiting scientist exclaimed that he did not share the superstitious belief regarding horseshoes keeping evil spirits out of the house, to which Bohr snapped back... "I don't believe in it either. I have it there because I was told that it works even when one doesn't believe in it at all."