26Money Spider

In some places, spiders of the family Linyphiidae are known as “money spiders.” Superstition apparently holds that a “money spider” crawling on you is sign of good fortune that will lead to wealth.
27. Burma's economy in the 60s-80s was shaped by a blend of Soviet-style central planning and Buddhist superstition. At 1 point new paper money was issued, all in amounts divisible by 9 (a lucky number), while canceling older bills, thus wiping out peoples' savings. This resulted in the 8888 Uprising.
28. The common sneeze responses such as "(God) bless you" or "gesundheit" originated from ancient superstitions. Some people believed that a sneeze caused the soul to escape the body through the nose. Saying "bless you" would stop the devil from claiming the person's freed soul.
29. There is a superstition called Curse of the Ninth (similar to Club 27) that every composer's ninth symphony will be their last, citing examples such as Roger Sessions and Peter Mennin.
30. For centuries old wives' tales claimed Molluscs stimulated the libido. Scientists found they were rich in rare amino acids that triggered higher levels of sex hormones when injected into mice.
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31Knock on Wood

The phrase 'Knock on Wood' derives from the pagan belief that malevolent spirits inhabited wood and that if you expressed a hope for the future you should touch, or knock on, wood to prevent the spirits from hearing and presumably preventing your hopes from coming true.
32. Kiyomizu-Dera is a Buddhist temple in eastern Kyoto in Japan. People used to jump off its 43 feet stage due to a belief that those who survived the fall would have their wish granted. Of the 234 jumps recorded during the Edo period, 85.4% survived.
33. Due to an urban legend, it's common belief among brazilians that you might die from poisoning if you eat mango fruit mixed with milk.
34. In Europe, the number 17 is considered unlucky because in Roman Numerals it's XVII, that can be rearranged to VIXI, meaning "I have lived", while in Japan the number 14 is considered unlucky because the words for 1 and for 4 are similar to the ones for "must" and for "die."
35. There was a form of Icelandic witchcraft involving "Necropants" where someone would flay the skin off the legs of a friend's corpse, steal a coin from a widow, and then wear the skin with the coin in the scrotum. The ritual was supposed to bring wealth.