It's Halloween, if you don't want anyone yelling BOO at you and your child then keep your ass at home. Halloween is supposed to be a bit scary and someone yelling Boo is tame compared to what they could be doing. How would it have really been any better if they had just opened the door and said "Stop It". One that does wind up sounding a bit rude, especially if by then other children had joined the annoying one. Two, many parents would yell and scream more about them saying "Stop it" because "HOW DARE YOU DISCIPLINE MY CHILD, WHO THE **** ARE YOU TO TELL THEM WHAT TO DO. THEY CAN DO WHATEVER THEY WANT TO DO" I have both been there and done that when I simply asked a child to please stop throwing things into my yard (intentionally) while it was being mowed. Yelling Boo is at least not asking for anything. Three, honestly if your kid is still young enough that someone simply yelling boo is going to cause them to piss their pants then you should be controlling them so they aren't doing things like repeatedly ringing the door bell. If you can't do that then take them home or to one of those half-assed mall trick or treats or something because clearly they are too young for the real thing.