Scrunching your forehead, pursing your lips, sealing tight your eyes, pulling your head back and into you neck in anticipation, And a bullet going through your temple.
Your hands are out to a T if you're a martyr, Or in front of your face in cover if you're scared. or one is held out to the side of your head holding the gun.
Imagine the initial split second of a piercing pain and then shattering of your skull like oxygen being pumped into your exploding bone marrow. The next split second feeling is very wet or very dry, like being submerged in water or sand and then being thrusted ten thousand feet under.
It's hard to imagine when I'm in my car listening to FM radio at a stoplight with a vanilla air freshener hanging from my rear view mirror.