There are two ways to retrieve a clip on LiveATC, assuming the frequency where the exchange occurred is even in the list of LiveATC feeds and the feed was up at the time of the exchange. The first method is from the archive files, which only keeps a rolling 30 days of history. In other words, archive files older than 30 days are removed in order to make room for the new archive files. Feed archives from October 8th, 2007 were deleted from the archives sometime the first week of November 2007.
The second method is that if someone here converted the archive file to an audio clip that was posted to this Audio Clip forum here. Again, this would have had to be performed within the 30 day window but these files are preserved indefinitely. As someone who has been on this board for a little over three years now, I do not recall ever seeing a posting in this forum containing an exchange of a goose hit. That would have been an interesting event. Apologies that there isn't better news in your quest to locate the clip.