If you'd like to know, it was created using one of the text to speech voices on the Mac (these were in there around Mac OS Classic, and still are as of at least OS X 10.4 Tiger, quite probably in Leopard and upcoming Snow Leopard).
'My Macintosh sprinkler goes . . . '
Mr. K told me about it when I was playing around with the text to speech and Mr. K said that I had basically accidentally discovered how they did it.