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Basically "unsolved things" which are subconsciously being remembered.

https://youtu.be/ZK79c2PqUWs

It's a survival instinct. We didn't like the situation and our mind wants us to remember it so we can try to avoid it.

Avoid farting extremely loud in the 3rd grade while trying to show off abs in class. Got it.

Thank you, this is helpful!

Makes sense, talking to a friend about I was told everybody has it, was wondering if there are specifics of what triggers it, specially in moments that don’t seem to fit in

But it doesn't know what it's remembering. Think of your brain like a computer. Your unconscious is looking for any .Regret files, but it doesn't know what's in them until your conscious opens the file and puts it back together.

I think there are, but from what I've heard, it's mostly subconscious, so we aren't really aware