I used to think that when you were a child that you had a "calf" muscle, and when you grew up that it became a "cow" muscle. Then you were on your way to turning into a cow.
A childhood belief about getting older

others believed things like this
- I used to believe the Golden Calf produced liquid gold instead of milk.— Trisha
- that as I grew up, my parents would "grown down," then I would be the Mom and Mom would be my child.Anon
- I used to believe that the meat you eat is turning to be your own muscles.— Yossi
- I used to believe that the wind was from the earth turning.Anon
- I used to believe that you could not make the car turn left or right without turning the blinker on.— Christy Shane
- I used to belive that however many pieces of cake you had determined how old you were turning!Anon