Machine Gun Reflex
The crazy urge to spin around and grin like an idiot when you first blast something with a fully automatic gun. It also hits you every time you fire a bigger gun than you’ve ever handled before.
I just shot my first automatic rifle and turned around like I was showing off at a school dance.
My buddy fired a .50 cal and immediately did a victory dance in the middle of the battlefield.
I shot a machine gun for the first time and smiled like I just won the lottery.