An interesting glitch that I found a lot of time ago, the "Headshot glitch". Is very simple to do. Just start a mission on Hard mode and start to kill enemies with the Taser. For unknown reasons any body part you will hit will score an headshot, once the enemy is dead. Perfect to save ammo, or get some challenge

Nice find. I'm gonna have to test this once I start Any% Hard IL runs. 🤔