My mom used to tell me that thunder makes the grass grow. I didn't realize it wasn't true until I was in college :)
A childhood belief about thunder and lightning

others believed things like this
- i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- I used to think that if you ate cat food you would die. I found out it wasn't true
— Bob#4 - i used to think that little tiny spiders would grow big while my mom wasn'r looking and eat me.— rodog
- I used to think that dandilions were marshmallows on grass— Vernon D'Souza
- I used to believe that money really did grow on trees, but grownups just didn't want us to know about it.— Mariah
- My grandpa and mom both used to tell me that if I didn't clean behind my ear that potatoes would grow there. — Bryan M.