Here’s what Gwen was referring to (from the Buffy the Vampire Slayer episode “Once More With Feeling”):

The setup: The town of Sunnydale has been stricken with song. Everyone breaks into show tunes, for the simplest of things. The Scooby Gang is sitting around the Magic Box trying to come up with reasons why this is happening (in song, of course). Anya, with a well documented dislike of bunnies comes up with the following….