Why would I want to introduce my friend to a complete psychopath? I wouldn't be a very good friend. I think it would really depend, First I'd have to be on good terms and most likely even be able to maintain a friendship with the person before I'd even consider introducing them to anyone.
As far as ex-recycling parties, I'd assume you'd need a quite large social group to pull something like this off which just isn't likely to find in my small town in Kentucky
