Simple camera shaker for Unity3D

CameraShaker.cs

using UnityEngine;
/// <summary>
/// Shake shake shake the screen!
/// </summary>
public class CameraShaker : MonoBehaviour
{
    #region Members

    private static CameraShaker instance;
    private Transform camTransform;
    private float shakeDuration = 0f;
    private float shakeAmount = 0.7f;
    private float decreaseFactor = 1.0f;
    private Vector3 originalPos;

    #endregion

    #region Timeline

    void Awake()
    {
        if (instance != null) Destroy(instance);
        instance = this;
        camTransform = GetComponent(typeof(Transform)) as Transform;
    }
    void OnEnable()
    {
        originalPos = camTransform.localPosition;
    }
    void Update()
    {
        if (shakeDuration > 0)
        {
            // Little move of the camera position
            camTransform.localPosition = originalPos + Random.insideUnitSphere * shakeAmount;
            // Decrease move intensity with time
            shakeDuration -= Time.deltaTime * decreaseFactor;
        }
        else
        {
            shakeDuration = 0f;
            camTransform.localPosition = originalPos;
        }
    }
    #endregion

    #region Public methods

    public static void Shake(float duration, float force, float decreaseFactor = 1f)
    {
        if (instance == null)
        {
            instance = Camera.main.gameObject.AddComponent<CameraShaker>();
        }
        instance.shakeDuration = duration;
        instance.shakeAmount = force;
        instance.decreaseFactor = decreaseFactor;
    }

    #endregion
}