When I was a child, I went through a Digimon phase. One night me my brother were outside jumping on a trampoline or something and we saw some little floating lights swirling around us. There seemed to be more and more of them and I got terrified cause I thought I was getting sent to the Digimon realm or something, so he and I ran away screaming. So that was my first experience with fireflies.
I used to be afraid of butterflies (they looked scary up close) and toilets (they made a loud noise) to the point up until late primary school I refused to use any bathroom outside my home unless someone was with me. Idfk why I was like this.
EDIT: Just remembered the time when I was little and I was immobilized by fear in my grandparent’s garden for nearly an hour (felt much longer to me as a child) cause I thought I had heard(???) a butterfly behind me. There was nothing behind me. I just heard a random noise and my brain flew with it.