Gingersol's "Never Noticed" plays at the end of the "The Wish," season 3, episode 9. Cordelia is angry at Xander and makes a wish in front of Anyanka the Vengeance Demon, who later become Anya, Xander's girlfriend. But in this episode Anya is still rocking the vengeance, and goes all out to give Cordelia some revenge by creating a Sunnydale where Buffy has never existed. This episode is famous for the alternate universe in which Vampire Willow and Vampire Xander are creepy lovers who torture Angel and stalk teenagers.
This is an ironically upbeat song to end such a dark episode.