Milk made your bones stronger by coating them and adding another layer of bone on top, so if I drank too much milk my bones would get too thick and clunk together and I'd be frozen.
A childhood belief about milk

others believed things like this
- Chocolate, they say, rots your teeth. I believed if you drank chocolate milk, your bones would be brown.— Dellio
- I used to believe that brown cows made chocolate milk and white cows made regular milk.— andrew mient
- I used to believe the milk would get sad if all I ever drank was koolaid.— al
- I used to be believe that white sugar was made from ground up bones— shedrez
- My Granny said if I drank milk and ate fish at the same time, I would die.Anon
- I used to think that if you drank too much milk and had a nosebleed, your blood would be white.— Tina