Large Grenade Explosion : Legacy FPS / MMORPG / RTS Discussion

When you have killed a group of Elites, Flood, Grunts, or Marines (they all usually drop grenades) in a small area, lure all remaining enemies to that location. Throw any type of grenade at the same spot. The following explosion should create a chain reaction on the grenades dropped by the Elites, Grunts, etc. and kill all enemies in one huge explosion.