Hello Dolly is a default plugin which comes with any WordPress install, it simply re-sights the lyrics of the popular Louis Armstrong classic, Hey Dolly, and displays them on the top of the admin control panel.
It's a bit of fun if nothing else, and very easy to edit. If you want to add your own lyrics, simply 'Edit' the plugin, and add your own lyrics after "$lyrics=", separating each lyric with a new line.
Some Examples (Feel Free to Download):
Rush Hour Quotes