Also took my small bug zapper apart to see why it sounds like it's zapping bugs but there are no bugs. Turns out a 47M Ohm resistor on the high-voltage circuit split open and was arcing. Of course, that's a crazy-high resistor value that I don't have in stock, and the cheapest I can get one is about $13 + shipping (it's a quantity pack, but still, a single or a million of them, I only need one, and the cost is the same regardless). Problem is, a new small bug zapper is $9.95 at Menards, so... I hate to be wasteful, but math is math. Off to the landfill for the old one.