Might be risky, the fishy in a bag? Maybe give him a stuffed doggy, cat, or horsey? I had Scott win me a fishy in a bag at the county fair by throwing ping pong balls at glasses of water. He finally won and I got my fishy (which he didn't want) and I let him name it since he had won it. He named it DD (Dee Dee). I asked him why and he said it stood for "Dead Duck" because all his other goldfish had always died. DD didn't die though and we had to release her in a pond 2 years later. She was bigger and happy.