The reference in the last post was to an obscure HHG2G quote from The Restaurant at the End of the Universe, as Zaphod Beeblebrox, the fugitive President of the Galaxy, tries to summon his great-grandfather's ghost:
"Concentrate," hissed Zaphod, "on his name."
"What is it?" asked Arthur.
"Zaphod Beeblebrox the Fourth."
"Zaphod Beeblebrox the Fourth. Concentrate!"
"Yeah. Listen, I'm Zaphod Beeblebrox, my father was Zaphod Beeblebrox the Second, my grandfather Zaphod Beeblebrox the Third ..."
"There was an accident with a contraceptive and a time machine. Now concentrate!"
And when the ghost finally arrives:
"Ah," he snapped. "Zaphod Beeblebrox. The last of our great line. Zaphod Beeblebrox the Nothingth."
"The Nothingth," spat the figure.