It can be fun to talk in binary. Most people will not understand what you tell each other, but those who know what they are doing will be able to decode it. If you really want privacy in your conversations, either talk in a private chat or use a "strong encryption" to make your texts unreadable to those who don't know your secret key. See this Blowfish addon for an example:
http://www.mircscripts.org/comments.php?id=1591 
