We intuitively think that the more vivid a memory is, the more reliable it is. For instance, most of us can vividly recall September 11, 2001: how we first learned of the attacks, where we were, whom we were with, what we did afterwards. But the vividness of those memories does not make them any more reliable than our more mundane memories. Any memory, including a vivid one, is a construction of the mind, not a video recording, and is therefore subject to distortion. For details, read this post at The Invisible Gorilla.