Are special needs kids easily scared?

Thinking about a Halloween costume. Was looking at a Grim Reaper cloak that was kinda cool, but would it scare special needs kids? Like maybe they won't come to get some candy?
I don't want to scare kids away, just have some fun.
One year I built a man under the stairs with one hand reaching out, and then put a speaker underneath I could remotely control. I made heavy breathing sounds and lots of ghost noises. Scared the crap out of a lot of kids as they came up the stairs, was funny. Of course the brave ones kept going.