Google is celebrating the 50th Anniversary of Doctor Who with a mini game on their main page. Go through 6 levels, finding all 6 letters (G O O G L E), while using levers to get across obstacles and avoiding exterminators.
I ended up taking like 18 minutes total. The Weeping Angel level was the hardest (in terms of how many doctors died), followed by the cyberman one. The Daleks turned out to be the least scary bad guys.