When I was a kid, the poem went:
"Trick or treat
Smell my feet
Give me something good to eat"
Kids were prone to being somewhat mischievous, so the "treats" were basically a payoff for not having them scribbling foul language with a bar of soap on your front windows or unwinding toilet paper through your front garden and over the trees. Or, for houses where the homeowners were particularly obnoxious, leaving a flaming paper bag full of horse poop on their front steps....
Of course, back then I remember that the homesteaders gave out regular sized candy bars, none of these little individually-wrapped, bite-sized things that seem to be all I can find in the store today, and almost every house/apartment played along with it all. The signs were: jack-o-lantern lit on the porch, they were "in". No jack-o-lantern, pass the house by for the next one with the pumpkin.
We only had about a dozen kids come by tonight, sadly. I live in a condominium complex, and we expected that there'd have been more children through in costume. After 8:30pm, when no kids had come up the steps for quite a while, we gave up and went out for a drive. Found a neighborhood full of kids in costumes, and where four houses on each side of the road had turned the street into ... well, there was artificial fog everywhere, strobe lights pointed up at the houses, where flapping bats were hanging off the eaves, etc., and when we stopped to admire the decorations several of the adults in the neighborhood came staggering out of their garages, dressed and in makeup as zombies, doing the shuffle and everything, straight for our car. They were really pretty good, too!
We laughed, gave them the "way to go" sign, and pulled away before they got to the car, but were wondering later, what does one do with zombies on the car windshield? Turn on the wiper and washer? 