Google has done some very fun things with their logo. The brand is obviously so strong the Google team can change the look of their logo for any holiday and other opportunity they see fit.
On Friday they had the best use of a logo I have ever seen. In celebration of the 30 year anniversary of Pac-Man the Google logo was actually a mini version of the Pac-Man game that you could play. Pac-Man music, sounds and everything.
Happy Anniversary Pac-Man and congratulations Google for keeping things fun, creative, and for thinking outside of the box.