The rigidbody that was hit by the controller.

	// Activate the gravity of other object we touch
	function OnControllerColliderHit(hit : ControllerColliderHit) {
		if(hit != null) {
			hit.rigidbody.useGravity = true;
		}
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnControllerColliderHit(ControllerColliderHit hit) {
        if (hit != null)
            hit.rigidbody.useGravity = true;
        
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnControllerColliderHit(hit as ControllerColliderHit) as void:
		if hit != null:
			hit.rigidbody.useGravity = true