This first version was on a computer monitor that I put in a window next to the front door. Over the years I switched to Unity and added a bunch of different texture variants, 3D models, particle effects and the like. The current version is projected on a sheet covering my garage. Kids really seem to like the jump scares.
The delay in the jump scare scream is because of a setting I was using for a bluetooth speaker. It seems every year there's some sort of little hurdle. I fixed it in time for the kids to see it though!