I think the saddest thing is hearing a 7- or 8-year old blundering around the haunt, frantically whinging "Where is the candy? Where do we get the candy?" Oh for (grumble-grumble) sake, kid, open your eyes and look around! If you went to a movie, would you spend the whole time crying for more popcorn and red vines? That's not why you are there. If the candy is the only thing that matters to you, go get Mom to buy half a dozen bags of fun size at Safeway and you can have your haul and skip the whole rest of the trick or treat experience.
When the teens do it (usually the young teens), okay, it's to be expected, they are trying on some attitude. And just maybe not...quite...grown out of being scared, which I suppose might also explain the younger ones. I suppose I should try harder to suppress the eye roll when they do it.