I used to believe that mushrooms in the grass grew if it was sunny and rained at the same time.
A childhood belief about plants

others believed things like this
- I use to think mountains were dead dinosaurs and grass grew over it.— Tara
- When I was around four,I used to think when it rained in my area,it rained over the WHOLE world too...Anon
- When I was a kid I thought that when it rained, it rained all over the world.
Anon - When it rained, it rained all over the planet simultaneously— Artgoober
- I used to believe that the whole world rained at the same time.— vannesa
- Every time it thundered and rained I used to believe that God was passing wind and "peeing"!Anon