Regret is part of being alive, but keep it a small part- Kerr Avon
An interesting question. My first thought in what context and to what end? Is this merely to view as an outsider and watch back as an instant reply as it were? Or, to actively live through the moment again as it was, or with the opportunity to change it. I assume the latter options would come about via some kind if Quantum Leap style technology so you’d be inhabiting your younger self. Tempted as I would be as there are numerous things I would like to revisit and change, I think the past should be left along and the only way is forward.
Anyway I have seen enough episodes of the Twilight Zone to know the past doesn’t turn out to be quite how you remember it.