I imagine it "happened" something like this...

In the beginning (yes the very beginning) there was nothing. This nothing is not nothing, it's something. It is impossible to define as it lies outside of anything we can or will ever perceive (it is perception). This "ability to perceive" required additional things be generated at the same time. It "presupposed" a random soup of pure "true" randomness. Within that "perspective", patterns emerged and not necessarily in a physical sense. Could have been the most simple of concepts at first, but in "true" randomness (without time) you can have complex patterns emerge (including time and the observer). Some could just have initial conditions where minute changes over time are allowed. Include continued existence for a concept that can grow in meaning and adjust itself based on what it is currently experiencing.

You see, I don't know that nothing exists, because nothing is as random as possible. Nothing is ever provable. You can only collect evidence of experience and work to predict and understand the probability for it to happen. This evidence allows you to judge how the future can behave.

As I see it, this is how you(we) got here. Or if nothing else, it is how we formed within the framework of these "physical bodies" and their perceived environment. All of your past could have been generated (in whole) at this moment with you as complex as you are.

Edit- Not only did we come into being capable of experience like this, I believe it is this possibility space that we abuse by using the Genius. We provide perspective a possibility for something previously not logical. Once we allow it to interact it is queued into experience. The more irrelevant the symbol the more possibility for that beautiful "true" random to be abused(utilized).