I looked out of my kitchen window just at the edge dark a few nights ago and there were at least a gazillion lightning bugs coming up from the grass. It looked like a fairy land. I stood there for several minutes and they were still coming. Joke: First lightening bug: What are you trying to do; set the world on fire? Second lightening bug: Nah, I'm just trying to show my ass.
My Dad worked as a steam locomotive crewman for the PRR in the early 1940's. He would sometimes bring home a track "torpedo" that we would detonate for fun! Track torpedos were small bombs placed on the rails by maintenance gangs that would be detonated by the locomotive's pilot wheels as a warning for the train to slow or stop because of some problem on the track ahead. We would place the torpedo on a flat rock and climb up a tree to drop another rock on it, causing a mighty BANG! Hal
You can feel safe enjoying lightning bugs. As far as I know, they are a principal predator of slugs and snails, both as larvae and adults (if they eat at all). https://en.wikipedia.org/wiki/Firefly
How about putting a copper penny on a railroad track and have the train make it the size of a quarter.