One of my mates goes all out for Halloween, i always refer to it as his Christmas. I never quite got it until i went last year and saw it in person...he's got his car set up as the ghostbusters car, projectors showing ghosts in the trees on his driveway and in his house windows... a life-sized animated Beetlejuice, loads of electronics stuff he's created over the year using arduinos. His kids and their friends dressed up and he dresses up too and plays a character... it was amazing.
he must have had over a hundred kids in about 3 hours. he gets through buckets of sweets!