My parents convinced me that when I was born they had the doctor surgically implanted a GPS tracking device behind my ear. I believed this so wholeheartedly that I went around telling all of my friends and their parents until my parents finally told me the truth.
A childhood belief about lies

others believed things like this
- Ironically my parents were born on the same day; so growing up, I thought all parents had the same birthdays. Anon
- I used to think that if you met your parents' boss, your parents would be fired!! AAAAAHHHHHHH!!!— Spoot
- I used to believe that we can change our parents and pay them to be our parents— yzoy
- When I was very young, I believed that my parents actual names were "mum" and "dad". — Margo
- When I was little, I believed my parents really had eyes in the back of their head.— Tera
- First I believed that my parents were brother and sister. Then I thought that my dad was also my mums dad. — Rainbow