Just because you cannot imagine a world in which cellular energy transfer mechanisms still work, but safety matches don't does not mean that it cannot exist. Human beings being the creatures that they are, I would bet that if we ever manage to manipulate a universe with different laws of physics to our own, one of the first things we would do would be to create human analogues in that universe to experience it all the more fully - look at all the online games like Everquest or whatever is cool these days: filled to the brim with human-like creatures and magic, and not a simulation of the Krebs cycle to be found.