I've seen this mentioned a few times as an evolutionist being stumped by a creationist's question. I think that's ridiculous; just because you can't answer the question right away doesn't mean you're stumped - it just means it's a hard question, and those take longer to answer. In fact, I think the answer he gives later in the video is actually quite well-spoken, though it takes as much a leap of faith to believe what he's saying as any other perspective (it would seem odd that we haven't found any of the failed-intermediate species). Anyway, just thought it was interesting. Thanks to Matt Stone for the heads-up.