Tomorrow is the 50th anniversary of Doctor Who, and Google is celebrating with an awesome little game. I suggest that you just go check it out, without reading my description of it.
If you must know what it is without clicking on it for yourself, it's an adorable set of puzzles staring Doctor Who. You get to pick any Doctor you want, and then you guide him on a pixellated adventure to find all six letters from the word "Google". The puzzles will have you timing your moves around Weeping Angels, Daleks, and Cybermen. If you mess up and die, you'll come back as the next regeneration of The Doctor.
If the doodle isn't available in your timezone yet, or if you aren't reading this on Friday, this link will take you right to the doodle's archive page.
Please fight in the comments about who is the best Doctor. Hint: Tom Baker is the best.