Reloading anytime I shoot. I put 10 rounds in someone-reload, double tap his head-reload, accidently nudge the trigger causing me to discharge one round from an otherwise full magazine-reload.
Oddly moving the right stick. Either holding it in one direction excessively, or moving it back and forth in one or more direction.
Pressing the button that is on the opposite side of the controller from the one I just pushed. Example: If I pull the right trigger, I feel compelled to pull the left trigger. If I click L3, I feel compelled to click R3.