What is biggest lie someone ever told you and you belived?

When I was very little around 7 yrs... Whenever I had fight with my elder brother or cousins.. They used to tell me that I'm adopted and if I don't behave properly they will return or send me back to that place lol... Even my mother sometimes used tell me the same just to scare me when I don't study.... Literally I was so scared of that place, I i never went there for some yrs 😂 😂