I used to belief that thunder was the clouds bashing against each other. It was when i was 18 i realised this weren't the case.
A childhood belief about thunder and lightning

others believed things like this
- I think thunder is the clouds fighting and bashing eachother and lightning is fire balls from the sun.— Crazy Cowgirl MADI
- My mother always told me that thunder came from clouds colliding with each other.— Martijn
- I was told as a child that the sound of thunder was from angels bowling in the clouds.— Patty, NY
- I used to believe that when it would be raining the white clouds lost to the dark clouds.— janet
- When I was a kid, I used to believe a nuclear plant was a clouds plant and could make magic clouds.— Tommy
- My mum used to tell me that thunder was god re-arranging the furniture.— Dale