From Mass Effect 2, an overheard conversation in the spaceport section of the Citadel:
"Now feel the weight of this slug! This is a 20-kilo projectile! Every five seconds, an Everest-class dreadnaught accelerates one of these to 1.3 percent of lightspeed! This results in an impact energy of 20 kilotons, the same yield as the city-buster that was dropped on Hiroshima on Earth! That makes Sir Isaac Newton the deadliest bastard in space! Can any of you maggots tell me Newton's First Law?"
"Sir! An object in motion stays in motion, sir!"
"No credit for partial answers, maggot!"
"Sir! Unless acted upon by an outside force, sir!"
"That's right! Now, I dare to assume that you maggots know that space is empty. When you pull the trigger, this projectile is going to hit something. It may be an enemy ship. It may be the planet behind that ship. It may miss completely, head off into deep space, and hit somebody ten thousand years from now. But I guarantee that somewhere, someday, it is going to ruin somebody's day! And that is why we wait for the damn computer to give us a damn firing solution! We do not 'eyeball it', Ensign Chung! This is a goddam weapon of mass destruction! We are not cowboys shooting from the hip!"
"Sir, yes sir!"
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.