Here's a lesson to all the interns of the world: Take some initiative and you very well may get rewarded. Take Google employee Denis Hwang, for example. While interning at the world's largest search engine, he began redesigning the Google logo to mark holidays and other major events. The designs, known as Google Doodles, caught on, and not only did he get a gig, but Google also decided to continue the tradition. After Google recently marked the 50th anniversary of The Flintstones with a new Doodle, we went back into the Google vault and put together a list of our past favorites. Who shines at no. 1? From one of the craziest April Fool's Day jokes to the honoring of legends, we bring you the 25 Greatest Google Doodles.