I sort of disagree, being startled isn't so bad in all contexts for one...though I can't say I go in a lot of haunted houses, I mean they can be sorta fun but I don't make a point to go to any around halloween unless I am with a group who wants to do that.
Also I don't think costumes make socializing harder, if anything they can be a good conversation starter...and for some reason wearing a costume can make some interacting easier.
Also I didn't know that the NT and Autism spectrum ways of having fun where completely and entirely different with no cross-over. I can have fun doing some of the same things that are also fun for NTs, I don't check myself anytime I am having fun to make sure its not 'NT fun' rather than aspergers fun. I mean NT, Autistic, whatever else....we're all humans with human traits.
Then of course its one of the few holidays that isn't focused on some aspect of Christianity at all, I mean granted most people aren't having traditional pagan celebrations...some of that has been rather lost but I still like that its not a celebration that can be attached to christian theology.
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We won't go back.