I thought I heard my third grade teacher mention that Jello was made with ground-up cow udders. I believed this for a while, too.
A childhood belief about nasty food

others believed things like this
- I used to think that sausages where made from cow's udders.— eoin
- My cousin once told me that glass was made from ground up beetles, and I believed her! — benjymous
- I used to believe that all cows could have udders regardless of sex.Anon
- A[n] nth grade teacher only had to finish the nth grade when he or she was in school.— MD Caruso
- I used to believe that cow udders were hollow bags full of milk.Yet I knew that human boobs were solidAnon
- I used to believe that Jello Shots were something that came out of a gun somehow. — J-E-L-L-O