We are big fans of the Jeremy Brett Sherlock Holmes series based on Arthur Conan Doyle's stories and make it a point to watch The Blue Carbuncle during this time of year.
I don't see a clip searching through googlevideo, which is a shame, but we know what it's like anyway now don't we.
12/8/2008: We watched this tonight and enjoyed it, as usual. I have found a couple of clips at youtube: (Both clips are gone as I check on 12/1/2009. Right now it's online, with embedding disabled, in parts at youtube, with part 1 here.)