Double Fine's most treasured son (apart from Jack Black, who is not a real man and was obviously designed by a committee of wacky game developers some time in the late 90s) is undoubtedly Raz, protagonist of their 2005 cult hit Psychonauts.
Psychonauts is classic Double Fine. It's a 3D platformer with some puzzley bits that sees Raz training to be a psychonaut at a secret government facility disguised as a children's summer camp by having adventures that take place inside people's subconscious brains. This premise, you will note, is a cracker, even if not that many people thought so at the time. It's become more popular in recent years, though, and every so often I go back and give it a look, most recently being this weekend. So let me be the latest in a long line of people to say, "Blimey, it's still a bit good, isn't it?"