When something horrible happens, your brain doesn't process the memories right. It stores everything-- sounds, pain, smells, feelings-- all mixed up. It doesn't matter if you believed it or it made sense; it gets stored.
If you still use the word "I" to identify and represent yourself, that explains why you still use less than 20% of brain capacity.
Latent brain functions can be enabled by force majeure when we are facing the weirdness of an unknown reality.