Or right, I suppose.
In a few weeks, I'll be running a LARP which takes place in its own past. It's basically an amnesia LARP where everybody gets to actually create their histories rather than simply discover them.
I'm building (partially complete) a rule set and world specifically to foster this kind of creation, and it will be extremely interesting to see if it works out. If I can get enough players.
I'll post the rules here once they're more complete.