Tracing back the origin of Halloween, we will discover that it has its roots on the practice of ancient Celtic culture of villagers wearing masks and macabre costumes during the 31st of October to frighten the spirits of the dead that they believe are looking for people to posses.
Then people became civilized, children are starting to wear scary costumes too. And now, adults seem to have figured out a way on how to celebrate the Halloween the adult style. Find how to do this in this great article at http://www.halloweenthisyear.com.