I don't like Yahoo. The only reason that I still use Yahoo Messenger is because I like the emoticons.
Emoticons are entertaining. When I have nothing better to do, I like to stare at them and laugh like a maniac--hours and hours of fun. I'm sure most of you know the basic ones: :) gives you a smiley, :( gives you a frowney (Is that the right term? Well, who cares?), etc., etc.
My favorite YM emoticon is, of course, the chicken. What? You don't know that there's a chicken emoticon in YM? Don't worry. We're here to give your inferior mind a dose of education.
Here is how you do it.
~:>
Look! A chicken! 
For those of you who don't like chickens that much, there is also an Oprah emoticon:
:@)
Have fun.