I used to think Rice Crispies cereal was made by taking all the marshmallows out of a rice crispie treat instead of the other way around.
A childhood belief about general

others believed things like this
- my brother told me rice crispies were really fish eggs we gave to the goldfish. I never ate rice crispies.— johnboy
- My older sister had me convinced that noodles grew on trees, but that rice was man-made...— Trusting little brother
- My Nan used to say that if you ate rice pudding every day you would live till 100.— Jayne
- Someone told my that rice was really spider eggs. I still don't look at it the same. Anon
- I used to believe that if you ate rice and water and jumped up and down you would explode. Thanks Dad.— Nina
- I used to believe the Metallica song "Trapped Under Ice" said "I turned down the rice."— Erik Z.