My question is what makes something a simulation? Or more specifically, does intent matter for calling something a simulation?
Consider the following:
Case #1:a well-known xkcd http://xkcd.com/505/ where by moving around a bunch of rocks, the guy implements a simulation of the universe.
Case #2: While I certainly don't think the substrate of the computer matters, what if it was the wind doing the rock moving? If you waited long enough surely the wind would implement the simulation. Most likely of course the simulated being would be in a Boltzman-brain type simulation ending the very next instant.
If Case #2 is a simulation, then then why shouldn't we just expect ourselves to live in a simulation created by some randomly jittering particles? If it does not qualify, then that amounts to saying that somehow we need the guy's intention to run the simulation.
I think that the criterion of intention as a condition for something to be a simulation is crazy.