If it/other manipulations like this happened frequently? Abusive. Once in a lifetime? Really mean, and could be a very bad memory for someone for a long time. A few times? Bad, bad parenting - and cruel.
I know this will sound disturbing to say - but I found it incredibly educational to watch how the extreme emotion happened in the kids. It was so visceral, so all-encompassing for so many of them. I think it's considered comedy because of the nature of the set-up: we don't think of halloween candy as anything but a trivial thing - and so the reactions of extreme pain are surprising/absurd. It's the old saying about 'tragedy is when I slip and fall on a banana peel; comedy is when someone else slips and falls on a banana peel.'
If they were telling the kids that their pet was dead, we as adults would see it as pure cruelty, with nothing to laugh at. Oddly, for the kids, there might not be a difference - depending on the age. Gone is gone; and something important and special and good being gone is awful - whether it's your goldfish, your candy, or permission to go outside and play.
I don't think the kids who fell, or raged, or exploded into tears were being histrionic; those looked like real reactions, not manipulative temper tantrums. They were really vulnerable. And the same was true of the ones who were OK, who forgave their parents - it was amazing to see how beautiful and fragile and amazing they were.
So, in a very odd way - thank you,
@void for posting it. I feel like I understand kids a little better.