Rise of Nations/Nightmare Fuel


 * When you kill a "person" unit with a flamethrower or Flaming Arrow, he/she catches fire, screams, and begins running away. Soon the run turns into a stagger, then the poor guy falls to his/her knees, rolls on the ground–still trying to put out the fire–and finally dies. It's almost a relief to see the muscles in their body relax and the corpse lie peacefully on the ground.
 * The fact that dead units linger on the map for a while. Over time, the corpses and debris gradually decay until finally vanishing from existence. Imagine the Fridge Horror that would ensure among units going through a field littered with the bones of their own countrymen.