Well when you figure it out, you should probably keep it a secret...

Seriously though, all good movies have these ingredients.

1) Hot chicks
2) Zombies
3) Lesbian scene(s), preferably with aforementioned hot chicks.
4) Guns
5) An idiot with big muscles who kicks ass.

I withhold the power of veto over any decision made which does not include at least two of the above.