I also must admit i never thought of this before i reading this thread.I think know why. I used to google more than any other search engine.
If you visit www.yahoo.com and click on the ( ! ) exclamation mark at the end of YAHOO, right before the search bar.
Well, that's just too bad..... I guess it only works for the U.S. domain? Looks like everyone that's accessing a different domain outside the U.S. other than www.yahoo.com can't see or hear what we can... Sorry...
It is pretty cool - if you like that, then you may enjoy a post on my blog from a while back called - Entertaining Search Engine Easter Eggs (Fun and Tricks)
Because you're clicking on the "yahoo", move as far over to the right as possible and click on the (!) exclamation point....
I too got the Valentine's day event only, how much hard I try I still get to the Valentine's day event only
Ohh My .. hahaha this is really cool ... Thanks Gurucreation ..your the best!!! How did you know it? Are you working in yahoo company? hmmmm