I used to believe that the green stuff in fried oysters was spinach, which relates to another Popeye-related belief.
A childhood belief about general

others believed things like this
- I used to think that if I ate spinach I would have a lot of strength (Popeye)— Fernando
- I used to think that if you ate spinach that eventually, you would be as big as popeye the sailor man.— Corrine
- I believed Popeye when he said spinach made him strong. Yuk Yuk Yuk— johnboy
- I used to believe that all my aunts were related to my mother and all my uncles were related to my father.— Mandy
- I used to believe that people with the same first name were related.— Rebecca
- I used to think that all people with the same FIRST name were related.— Lisa