Maybe you live near someone with a Tesla Coil. I have a whole assortment of Tesla Coils from very small 3" sparks to a large 1 that will makes 27 foot diameter circle of sparks and arcs in the back yard. When I fire up the big Tesla Coil it sets off every alarm system in the neighborhood for a 6 block radius of my house, 100 garage doors are going, up, down, up, down,up, down,up, down,up, down,up, down,up, down, 700 motions detector lights flashing, on, off, on, off,on, off,on, off,on, off,on, off,on, off,on, off,on, off,on, off,on, off, 150 cars horns honking, 40 home alarms sounding, lots of people are freaked out wondering what is the world is happening. LOL