I was also thinking of Roe's Summer of NO, which happened over several threads. Just one long thread might have become way too unwieldy for reading. At the same time, it wasn't the same thing over and over, in that as Roe's behavior changed and K'nihave's behavior evolved in response, it was (for me, at least) extremely educational on how to develop the polite backbone. It wasn't just one instance, but a sequence in which Roe was almost under siege, and how she learned to deal with it. Without all the constant references to previous threads, I don't think it would have had as much resonance. (It helps when people post the links -- thanks to those who do it, I don't know how, but it is so useful).