if (instance_exists(myobject) == 0)
{
    instance_destroy();
    exit;
}
if (bounce == 0 && instance_exists(myobject))
{
    remvspeed = myobject.vspeed;
    remgravity = myobject.gravity;
    myobject.gravity_direction = 270;
    myobject.vspeed = -bounceamt;
    myobject.gravity = grav;
    nowy = myobject.y;
    bounce = 1;
}
if (bounce == 1)
{
    if (myobject.y >= (nowy - myobject.vspeed))
    {
        myobject.y = nowy;
        myobject.gravity = remgravity;
        myobject.vspeed = remvspeed;
        instance_destroy();
    }
}