Search Engine Trick: Easter Eggs

I have two search engine "easter eggs" for you. First a new one (for me at least) thanks to Google Blogoscoped:

Enter number of horns on a unicorn into Google to see what Google Calculater says....

For an older one that many of you probably already know, go to the Yahoo search engine, turn up your sound a little and click on the exlamation point on the Yahoo Logo.