public function delete($user)
    {
        if (!is_object($user)) {
            $user = $this->find($user);
        }

        if ($user instanceof User) {
            if ($this->fireEvent('deleting', array($user)) === false) {
                return false;
            }

            $user->delete($this);

            $this->fireEvent('deleted', array($user));
        }
    }