I love the scare a simple blast of air gives. The initial sound is startling if loud enough. How is this achieve? Is it something I can buy off the shelf and do before Halloween or do I need to order parts? If I can buy off the shelf can someone tell what and how to do it. I can always wIt till next year if it is too late. Thanks in advance. I do have a small craftsman compressor. Last time I did it manually but I would like a louder blast sound and automate it too.