Ace:
I have a theory. It is unlikely, let's say 1 out of &inf;, that by freak chance that a galaxy formed and it was exactly like ours an that there are people in it and they are doing exactly what your doing right now. But if the universe is infinite, times that chance by infinity and you get 1 out of 1, it would be impossible to not have a "mirrored by freak chance universe". There would also be variants in which are slightly different.