Superstitions are irrational beliefs, especially regarding the unknown. Some common British superstitions include touching wood to make a wish come true, having a horseshoe above the door for good luck, and saying "white rabbits" on the first day of the month for luck. Other superstitions regard certain numbers, days of the week, mirrors, salt, and umbrellas as unlucky. There are also many superstitions related to food, cutlery, weddings, animals, and birds. Superstitions were once widely believed to influence luck, life events, and avoid misfortune.