Its uselesss appeareance is, for most users, a real annoying thing.
Clippy goes further and it is a parody of this great assistan. Forget Clipo, now you have Clippy.
As the parody it is, Clippy magnifies what Clipo used to do and now it will appear whenever it want and will tell you anything, no matter what you are doing, it will appear and will tell you a joke, or simply will remind you that he is there.
Clippy is fully customizable and you can add the sentences you want just editing a .txt file in the root folder of Clippy.
You will enjoy a lot using this tool and, of course, when sending it to your friends.