Met him at the Computer History Museum, maybe around 2007. He had a branching storyboard-style presentation with 100's of slides. In the middle of the talk, he asked the audience about which direction they wanted to explore. Based on a show of hands, he proceeded to branch off into a few dozen more slides. Pretty epic.
Anyway, Turtleducks: we met later and I demoed a visual music synth. Was wondering if it would fit somehow into Sim-City. He said: "Well, what I have is a turtle and what you have is a duck. You can't just put a duck on a turtle and get a turtleduck." [Am paraphrasing.]
Ironically, a year later, he introduce Spore -- thus, solving the turtleduck problem. At least, in the turtle/duck domain.