Yes, the question that made me realise anything is possible, no matter how rediculous it sounds. Including Religion and Ghosts and OBEs, etc, etc.
Just as hard for me to comprehend is how science currently tells us there is more than 1 thing. (eg Gravitational Force and Magnetic Force, etc).. why? It seems far more logical if everything was made from only 1 thing. Which is what i tend to believe.. on the smallest scale i think we are all just energy, but what is energy? But whatever the case when you get to the smallest building blocks of existance, then what are they made of? nothing? seems the most logical answer to me. So i think the eventual goal of science (not that well ever be able to get there) is to realise we dont exist, we are made from nothing. (ok that was just a little thought process, and not what i really believe, just an option).
Anyway if our universe exists, then its obviously possible for another universe to exist with completely different forces/matter/whatever. right? Could they exist in the same space? If not where would they exist? Is there some place we can never get to even if (although impossible?) we visit every inch of our space? (Is our space part of our universe, or is our universe part of space?). Can you comprehend that? Maybe the Gods and spirits and whatever are from another existance... would explain a lot, but would also mean the Gods probably has just as little idea about how they exist as we do.
I think our 'empty space' is actually something, there is a nothing that is more nothing than empty space. Because empty space exists.
My answer to the original question has always been 'because if there wasnt something then there would be nothing'.... seems stupid i guess.