Neil: Once there was a single point in the universe that was unimaginatively small and dense. So dense that all the matter in the universe was contained in that single tiny point.
Adam: Whoa, whoa whoa! How could it be unimaginatively small if you egg-heads imagined it? Sorry but you can't sneak those things by me because of my hyper-vigilance.
Neil: OK! OK! Now suddenly this incredibly small point explodes. Trillions and trillions of atoms burst forth. Atoms of matter and anti-matter. The atoms of matter and anti-matter annihilate each other. For each 400,000 billion atoms of matter and anti-matter just a single atom survives the annihilation. And those surviving atoms are what end up making up the universe - you, me, the planets, the stars, everything.
Adam: So what you're saying is the Big Bang was like if God farted...
Neil: Dude - what?
Adam: Yeah imagine God's unimaginatively small clenched sphincter. Then suddenly boom! The universe's biggest fart. The air outside annihilates the air from the fart and all that is left over is a tiny bit of fecal matter. You, me, the planets, the stars, everything - we're God's leftover fecal matter.
Neil: Well I guess that's one way to look at it but Adam you know I'm an atheist right?
Adam: Me too - but if you can imagine that other shit why not this?