At the sight of another of it's kind, Radio paused. Then laughed impishly, waving to Eclair with one of it's strange, eletricial apprendages. Walter watched the pair of them like a hawk, expecting them to immediately bolt for the nearest electrical appliance to possess and cause chaos with.

"I've been trying to train it to behave, but Radio is a persistant ghost." So had he, but he hadn't spooked people just for the sake of it. His hauntings had a purpose, while Radio just seemed to try and get a reaction out of people. Including Walter himself, who was clearly not impressed with it.