A friend and I were playing a game. He had two creatures on the field and I had none. I played [C]Switcheroo[/C] and targted both of his creatures. Would I gain control of both of them, or would it have no effect because I control no creatures?
"Exchange control" means the controller of Creature A gets to control Creature B, and the controller of Creature B gets to control Creature A. In your example, it's the same player, so nothing happens.