We have never had any bad experiences, and actually we really enjoy all the little ones (and not so litte) dressed up and having fun out in the dark. As a child we did nothing for halloween - bonfire night was the big one. It has always felt very sociable and rather nice - lots of children knocking on doors and people smiling and speaking to each other. The pumpkin (or other decoration) seems to work well as an indicator as to whether you are taking part or not. I am sure if I have little horrors throwing things at the door I would not feel so benevolent, but over the past ten years, it has been ok.