Terry, the big spider who hung down over the front of the porch. I sat up in the guest bedroom in the dark for most of Halloween night, with two control switches (surge protector strips). One turned on the lighting on her; a main light and a strobe, along with a recorded spider-y chittering noise. The second turned on a shop vac, set on 'blower', aimed right down on the poor trick or treater's heads. I usually saved that one for when they were walking out.
But could a face that pretty really scare anyone?