How to Rock/Tear Jerker

"Stevie: (visibly hurt) You people sicken me."
 * In "How To Rock Braces and Glasses", Stevie walks into the bathroom just in time to find that Kacey has rejoined the Perfs and is deeply wounded by the betrayal:

"Kacey: Molly is only using you to get information.
 * In "How To Rock A Secret Agent", Kacey gets Stevie to infiltrate The Perfs in order to learn what dress Molly will be wearing at an upcoming school dance. Stevie starts Becoming the Mask when Molly is nice to her and remembers essential details about Stevie that Kacey never knew. (Specifically, her middle name, her favorite color, and her birthday.) When Kacey tries to snap Stevie out of it, we get this exchange:

Stevie: (angrily) No Kacey, you did that."


 * The devastated look on Kacey's face after that remark really seals it.