There can be only one Burger Slayer—per month, that is. But thanks to an online/mobile/user-generated campaign from L.A.-based interactive agency Spacedog for Carl's Jr. and Hardee's, a new king of consumption will be crowned every time the calendar flips. Fast food warriors can join the fray by aiming a cell phone camera at themselves as they do battle with (i.e. eat) a monstrous Carl's Jr. or Hardee's burger. The resulting image of carnivorous destruction is then sent or uploaded to one of the sister restaurant's websites, where the best ones will be voted upon by the hungry masses. The slayer who garners the most votes receives spoils of victory in the form of free burgers for an entire month.