Can't believe no one put this already, since it was common knowledge among all my friends. I used to believe that the core of a golf ball was a highly toxic poison that would kill you.
A childhood belief about sport

others believed things like this
- It was common "knowledge" where I lived that if you picked dandelions then you would wet the bed.— Holly
- I used to believe that the dust at the top of doors was highly poisonous and could kill you.Anon
- my sister told me that bunkers on golf courses were for children to play in while their dads played golf.— Julie
- I used to belive that the Gulf war was actually the Golf war and the people hit each other with golf clubs...— golfgirl
- I thought tonic water was toxic water and wondered why would anyone drink it if it is toxic?— Dr.Badguy
- I used to think that 'non toxic' was a color. I always did wander why is was written on every crayon.— Maddy