I always had some sort of interest in science and how the brain works.
But this is the most interesting thing ive ever encountered:
https://en.wikipedia.org/wiki/False_memory_syndrome
TLDR:
50% of the human population, believes in something that never occurred for them. It can be everything, but most likely something traumatic. It can also be something more positive. It can be something like you got chased by a dog and that's why you are afraid of dogs to like you been a professional hockey player(when you have never played hockey before - this was a case in one of the studies for a person).
It's about that you tell a story over and over until you believe it and the memory becomes yours. The thing here is what makes you tell yourself a lie to start of with.
Just felt like sharing