My moving eyeball pumpkin Arduino code.

halloween_eyeballs.ino

#include <Servo.h>

const int SERVO_COUNT = 10;
Servo servos[SERVO_COUNT];

const int SERVO_MIN = 40;
const int SERVO_MAX = 180;

void setup() {
  for (int i = 0 ; i < SERVO_COUNT ; i += 1) {
    servos[i].attach(i + 2);
    delay(100); // slight delay to prevent current draw reset on startup
  }

  Serial.begin(9600);
  randomSeed(analogRead(0));
}

void loop() {
  halloween();
}

void halloween(){
  int servo = random(0, SERVO_COUNT);
  set_servo_rand(servo);

  int del = random(100, 500);
  delay(del);  
}

void set_servo_rand(int servo) {
  int pos = random(SERVO_MIN, SERVO_MAX);
  servos[servo].write(pos);

  int del = random(0, 500);
  delay(del);
}