Cactus Balls

In the new A Minecraft Movie and in the live event for the movie we see a weapon called cactus balls. I think this weapon would make a good addition to the actual game; in the movie we see they can be dispensed, and, in the event, they can be dropped on the ground and do damage to mobs that walk into them. I think in the game they could grow on cacti and be taken off by the player and can be used as a weapon, by either being dispensable and/or the player being able to throw them on the ground.