My weapon, my brain

If you know what's good for you, you won't pull that trigger
See, it matters not, to me, that you're bigger
Once I get started, I go into beast mode
You'd better create distance, before I unload
See, I have lived too many years, in fear 
So let me make myself crystal clear
If you're going to push my buttons, just know
Sometimes it's best just to eat crow
Because, if I unleash my ammo on you
There isn't much you could say or do
And if, by chance, I never see you again
I hope you learned something from my weapon, my brain. ~kjl