When i first saw this, I thought Google did a doodle in conjunction with International Women's Day.
So I excitedly share the link with my colleagues, asking them to celebrate Women's Day together. When I opened another browser with the same URL, I was a little puzzled it didn't appear there.
That's when I realised, my Mozilla browser was opened with my Google login, and somehow I had set my birthday in the profile. Upon mouseover only did I realise the doodle was for me. ME! Kinda neat eh?