Explain
The Big Bang in terms of a popcorn machine
The Big Bang is essentially a popcorn machine that decided to start making the entire universe instead of just salted snacks for the Odeon.
Everything started as an incredibly dense, hot kernel of reality, vibrating with so much energy it had no choice but to pop. The crucial thing to remember is that this was not a firework display in a dark theatre, but the popcorn machine itself suddenly stretching out so that the space between each kernel became vast. The expansion happened everywhere at once, turning a speck of concentrated potential into a piping hot mess of hydrogen, helium, and cosmic background radiation that probably tastes slightly of burnt butter if you find the right frequency.
As the universe cooled, the initial frantic kinetic energy began to settle into the structural integrity of stars and galaxies, much like how the really good pieces of popcorn eventually find their way to the top of the box. Galaxies are just the clumps that didn't quite make it into the bin, drifting further apart as the machine keeps churning, pushed along by the relentless expansion of the cosmic heat tray. It is a slow, ongoing process, and we are currently living through the part where the machine is still humming away, leaving us wondering if we should have asked for the smaller portion.
Where the analogy breaks downThe universe does not have a bottom tray filled with unpopped kernels that nobody wants to touch.