WARNING: This prop really does contain high voltage and is extremely dangerous; using any of these designs or code is entirely at your own risk. High voltage should always be treated with respect, and should only be used with the proper safety precautions.
This code powers a fuse-box prop that I developed. The prop has an extremely loud sparking sound, along with movement and light to startle guests. It's remotely triggered via a small remote. It also features a small speaker with a constant 60hz buzz, to make the guests uneasy as they walk by it.
This code makes use of my Animately library, and is powered by a custom PCB with an ATmega328p chip (an Arduino, basically.) The sparking is provided by a high voltage coil from AliExpress.