Our collective memory is one long story. It starts quick and changes almost as fast. When you know someone, or experience an event, you remember it later, but you don't remember it perfectly. These memories become embellished with hopes, desires, fears and other thoughts that linger always at the edge of what we are doing and thinking. These alter the remembered reality and become tales told over and over again.
Those retold tales alter as well, aspects that seem to garner the greatest reaction are enhanced and those that do not are set aside. Thoughts of what could have happened mingle with memories of what did happen and the experience becomes slightly altered.
In time generations retell these tales and stories and the whole become part of the mythic fabric of what was, though not what was.