Chat Moods

I chat in light moods most of the times. But of late, I am confused about the mood of the person at the conversation POINT, rather confused if the person is serious/joking/mocking,etc/.. I use Y! and gtalk messengers. I think v don't have the option to convey my mood which I can change depending upon the topic v r talking about. It would be helpful if I can set a chat mood/theme for each person I am chatting with. Though skype provides the chat topic to be set, a more eXtra thing like the emoticons would be helpful.