// Instantiates a prefab with a random rotation at the world-origin

var prefab : GameObject;
Instantiate(prefab, Vector3.zero, Random.rotation);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public GameObject prefab;
void Awake() {
Instantiate(prefab, Vector3.zero, Random.rotation);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public prefab as GameObject

def Awake():
Instantiate(prefab, Vector3.zero, Random.rotation)