While standing next to him, he utters the line: "Indulgent, what rhymes with indulgent, effulg... nah, that's terrible".

This is obiously a refernece to William the Bloody, wannabe poet and soon to be turned into a vampire later known as Spike from Buffy The Vampire Slayer.
During a flashback scene the Episiode "Fool For Love", William writes a pretty bad poem:

"My soul is wrapped in harsh repose,
Midnight descends in raven-colored clothes,
But soft... behold!
A sunlight beam
Butting a swath of glimmering gleam.
My heart expands,
'tis grown a bulge in it,
Inspired by your beauty...
Effulgent."