public EntityType getRandomMob() {
        final Random rand = new Random();
        switch (rand.nextInt(9)) {
            case 0:
                return EntityType.SPIDER;
            case 1:
                return EntityType.CAVE_SPIDER;
            case 2:
                return EntityType.SKELETON;
            case 3:
                return EntityType.CREEPER;
            case 4:
                return EntityType.PIG_ZOMBIE;
            case 5:
                return EntityType.ZOMBIE;
            case 6:
                return EntityType.ZOMBIE;
            case 7:
                return EntityType.ZOMBIE;
            case 8:
                return EntityType.ZOMBIE;
            default:
                return null;
        }
    }