this is actually my mom's old childhood belief. In third grade, her class was located in a portable building which had housed the special education class the year before. My mother was the youngest of five girls. Ergo, her sistgers convinced her that she had been retarded from birth and that nobody had wanted to tell her. Idunno how long she fell for it, but knowing my mom, it may have been some time.
A childhood belief about classes

others believed things like this
- I used to believe that the Chinese boy in my kindergarten class flew from China every day to get to class.— Debi
- I remember a girl in my kindergarten class told me she wanted to be a waterfall when she grew up.Anon
- I used to belief that the birth mark on my dad's leg was where he spilled his coffee... EVERY morning.— Liz
- I used to belief sloths lived in trees outside my childhood home. My older sister told me so.Anon
- The very first time I saw a globe (of Earth, yes) I asked where "College" was located.— Shade
- I used to believe that the white boxes that housed bee hives were cow graves.— Bub