Or how about a guy and a gal? ;D
Like maybe before the big bang there was just 2 little particles, let's say, one electron and one positron, in empty space. Over the eons, they eventually collided. Since space was empty, velocity had no meaning. Only relative velocity had meaning (just like today). When they finally collided, their relative velocity was so near to the speed of light that their relative momentum carried enough energy E = pc (the rest mass portion of the 2 particles is so small that it can be ignored) that the single matter/antimatter annihilation explosion was the Big Bang.
Thought provoking posts get my imagination stimulated.
Why not :)
In my case, I don't really consider what could happen before the big bang, as the theory we know today ceases to be valid and there is actually no known way to probe that. Of course, others are thinking about options and it is good (in the same way one single person cannot take care of everything). ^^