JinxyKatte said:
A grenade that every time it explodes it makes four copies of its self one metre away N S E and W of where it exploded. Each of these grenades will also do the same. Each grenade has a blast radius of 1 metre. Urm yeah they have a time delay of 30 seconds each.
That's less of a grenade and more of a horribly inefficient doomsday weapon isn't it? All it guarantees is that it will eventually have exploded a grenade over every spot of the planet. You could run into the center where the first grenade went off during the 30 seconds it takes the next 4 to go off and be safe until they come back around again. Then again, remembering to dodge a grenade every 5 years or so could get annoying. Unless it spawns one back where the first one was, meaning you have to dodge every 30 seconds to survive. In which case, we must remember the words of the great blue philosopher: "You can't destroy everything. Where would you sit?"
Since I can't think of anything clever on account of still thinking over the term "horribly inefficient doomsday weapon" and how fun that sounds, I'm going to go with two weird entries I thought of just now. First is the Ninjanade, which isn't at all efficient because it doesn't kill ninjas, it disperses a cloud of pure ninja which can either formulate into one awesome ninja or twenty crappy ninjas. The twenty crappy ninjas only serve to slow down your foe by filling the road behind you with their corpses as you run away. The one awesome ninja is reasonably angry about the fact that he was just spawned from a grenade and kills everyone within 10 miles in the next 10 seconds. Do not use unless you run really, really fast.
Next is the Deus Ex Machinade, which wraps up all loose ends in a work of fiction and immediately ends the story. Only use if you are ready for the story to end. Just think how many unnecessarily bad sequels could have been avoided with this technology. If someone had set one off after the exo-suit/sentinel battle in "The Matrix: Revolutions" was over and before the weird baby alien in "Alien: Resurrection" showed up the world would be a better place.