I was wonding this as well. I got a potty from the pound shop the other week but ds just runs around and around it laughing.
What do you do with little boys as I'm not sure if he sits on it that his bits will be pointing down? I'm afraid I might get wet.
When he has that look on his face and I ask him what he is doing he says poo so I know he knows but I haven't dared take his nappy off yet.