At Buffy's 19th birthday party, Giles finally realises that he is a middle-aged man hanging around with a bunch of teenagers and starts to get depressed about his life. He feels even more like the third wheel when he finds out about Riley and the Initiative, which Buffy neglected to tell him about. When Ethan Rayne returns to town, instead of kicking his butt back to England, Giles goes for a drink with him. The next morning Giles wakes up and notices that he has turned into a demon.
Linger — The Cranberries
[Alternate airing] Beginning, Riley and Buffy make out.
In Good Time — Jessica Sheely
Beginning, Buffy and Riley make out before Willow enters.
Over Divine — 12 Volt Sex
At Buffy's birthday party. Plays when Xander and Anya are talking to Giles.
Then There's None — Other Star People
At Buffy's birthday party. Plays when Willow is talking to Giles and Buffy introduces him to Riley.
Down Down Baby — Scott Ellison
Ethan and Giles get drunk.
Fyarl in the Morning — Christophe Beck
Giles realizes he’s a demon.