Do you ever wonder why people don't walk under ladders or don't open umbrellas inside the house? Many people believe in such superstition. Some superstition are so old that we do not know how they started or where they came from. Actually, historians believe that superstitions have existed as long as people. Thousands of years ago people did not always understand why certain things happened, so they must have invented ways to explain them. Many of these explanations have survived through the ages, and people act in certain ways because of some long-forgotten beliefs.