The Stage is Yours.

[FemmeRealism]

What's our best theory for the "cause" of the BB? Gravity?

Perhaps (law of Conservation of mass/matter/energy time) all matter was condensed at one time. Say the kinetic vibrations of all subatomic particles created a load of heat, increasing to the melting point of many of the elements in the condensed universe. Elements changed physical properties and suddenly the molecular structure changed enough that some things could bond, did and boom. Thermal expansion and all that.
Say the BB was completely spontanious. Say the BB never happened, and the universe just always "was." Say in the condensed mass a singular omnipotent ameba was lonely and created more amebas, whose extra mass caused the imploded universe to explode.
The first is my theory. The rest are just kind of bullcrap to illustrate that anything may have happened.
Who the hell (see what I did there?) could possibly know?

[catfish]

Exactly! I like that answer.

[ElDinero]

So still waiting to find out how you jump from 'no idea' to your beliefs?

[Jackalope]

So still waiting to find out how you jump from 'no idea' to your beliefs?

Wishful thinking?

[FemmeRealism]

So still waiting to find out how you jump from 'no idea' to your beliefs?

Opinionated expression? Open mind? Babbling?

[Reforged]

So still waiting to find out how you jump from 'no idea' to your beliefs?

Oh, oh! My turn... erm... by being an opinionated jackass who sees nothing wrong with self-contradiction?
Do I win a prize? :-)