duck

using UnityEngine;
using System.Collections;

public class Pusher : MonoBehaviour {

    float oz;

    void Start () {
        oz = transform.position.z;
    }

    void FixedUpdate()
    {
        Vector3 pos = transform.position;
        pos.z = oz + Mathf.Sin(Time.time) * 0.05f;
        transform.position = pos;
    }
}