According to Webster's dictionary, superstition is n. any belief that is inconsistent with the known laws of science or with what is considered true and rational; esp., such a belief in omens, the supernatural, etc.
Halloween is traditionally the time when common superstitions, folklore, myths and omens carry more weight to those who believe. Superstition origins go back thousands of years ago. Beliefs include good luck charms, amulets, bad luck, fortunes, cures, portents, omens and predictions, fortunes and spells.
Bad fallacies far outweigh the good, especially around Halloween when myths run rampant. When it comes right down to it, many people still believe that omens can predict our destiny and misfortune -- particularly for the worse.