You know those grinches that, on Valentines Day say, "I don't need a holiday to tell me when to express my feelings for my loved one" or, on Mothers Day say "I don't need a stupid holiday to tell me when to call my mom?" Well, that's one reason I like Halloween --because those bias keep their yaps shut for once. After all, it's unlikely that those negative nancies are going to say, "I don't need a stupid holiday to tell me when I can dress like Boba Fett and go door-to-door begging for candy from strangers." Like so many holidays, most of the customs are under threat of disappearance due to the media standardizing, simplifying and corporatizing its observance.
On Halloween, the boundary between the alive and deceased is erased or at least thin. It was observed as Samhain by the Celts and other Euros until 837 AD, when one of the popes decided to move All Souls Day from May 13 (previously chosen to capitalize on another pagan holiday -- The Feast of the Lemures -- on which day Romans would exorcise their homes of evil spirits) to its current date. Over time it has evolved from a harvest festival, to an opportunity to divine the future (in the 18th century), to an opportunity for children to obtain candy, to its current status as an excuse for drunken adults to dress like media figures or slutty versions of mythological beings.