// Starting in 2 seconds.
// a projectile will be launched every 0.3 seconds

var projectile : Rigidbody;

InvokeRepeating("LaunchProjectile", 2, 0.3);

function LaunchProjectile () {
    var instance : Rigidbody = Instantiate(projectile);
    instance.velocity = Random.insideUnitSphere * 5;
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Rigidbody projectile;
    void LaunchProjectile() {
        Rigidbody instance = Instantiate(projectile);
        instance.velocity = Random.insideUnitSphere * 5;
    }
    void Example() {
        InvokeRepeating("LaunchProjectile", 2, 0.3F);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public projectile as Rigidbody

    def LaunchProjectile():
        instance as Rigidbody = Instantiate(projectile)
        instance.velocity = (Random.insideUnitSphere * 5)

    def Example():
        InvokeRepeating('LaunchProjectile', 2, 0.3F)