private void setLastDirectionWrong() {
		String oppositeDirection;
		switch(knowledge.get(knowledge.size()-1).getValue("direction")) {
			case "forward":
				oppositeDirection = "backward";
				break;
			case "backward":
				oppositeDirection = "forward";
				break;
			case "stay":
				oppositeDirection = "forward";
				break;
			case "left":
				oppositeDirection = "right";
				break;
			case "right":
				oppositeDirection = "left";
				break;
			default:
				oppositeDirection = "backward";
		}
		knowledge.get(knowledge.size()-1).setDirection(oppositeDirection);
	}