well one of the things that makes it work climatic and makes it funny is that the last part is sort of an anti-climax. You have these outrages tales by Narvin and Leela, who yet still somehow fail at their task, and all K-9 has to do is to send the tenth Doctor one line = anticlimax = funny :D... as least I think it is (and I think at least Terry Pratchett would agree with me). *g*