Hi all, i would like to detect collision between the worm and my player. So if the player collide with the worm, it will fly away and deduct the BP. I have added rigidbody to my worm. And when i run my games, my worm drop infinitely out of the scene. Can i know why?? I am very sure that it is place properly on the terrain. So aren't very sure why it will drop infinitely. Please help.

// Make all rigidbodies we touch fly upwards
function OnCollisionStay(collision : Collision) 
{
    // Check if the collider we hit has a rigidbody
    // Then apply the force
    if (collision.rigidbody) 
    {
        collision.rigidbody.AddForce (Vector3.up * 15);
    }
}