[Oldcockatoo]

Hello, everybody!
Now I've got a question about punishment which can be used for greys. Sometimes my grey behaves terribly, he can scream very loud and for a long time because he's in good mood and excited with toys, for example. Of course that's great to have a happy bird and I understand that screaming is parrots' natural behavior and I don't mind my bird to scream but I don't want him to do it for hours. How can I control it? Firstly I tried to use a sprayer but since my bird has started to take a shower under the sprayer it became useless. I don't want to spoil our relations but I just want to show him that some behavior is not acceptable.