THE PATTY DUKE SHOW. BtVS Intertext/Allusion.

In " This Year's Girl" (Season 4) when Faith awakens from her eight month, Buffy-induced coma, she seeks revenge. After spying on Buffy and the gang, she confronts Buffy on campus at UC Sunnydale. The two have a brief battle, and Faith knocks out two cops so she can escape. While three mysterious men arrive in Sunnydale, Faith goes to Buffy's house and attacks Buffy's mom. Just as Faith insists to Joyce that Buffy doesn't care about either of them, Buffy leaps through the window and attacks Faith. Faith, however, is ready for Buffy, and switches bodies with the good Slayer using a gift left to her by the mayor. When Buffy's mom comes downstairs, she sees "Buffy" and asks her if she's okay. "Buffy," smiling evilly, replies that she's "five by five." — Short synopsis by Anthony C. Blade

The following dialogue is taken from the Buffy Dialogue Database:

Xander (regarding Adam and Faith): "I'd hate to see the pursuit of a homicidal lunatic get in the way of pursuing a homicidal lunatic."

Willow (about Riley): "What did you tell him?"
Buffy: "The truth. That she's my wacky identical cousin from England, and whenever she visits, hijinks ensue."
Willow: "It's good that you two have such an honest relationship."

Willow: "She's like this cleavagey slutbomb walking around going 'Ooh. Check me out, I'm wicked cool. I'm five by five.'"
Tara: "Five by five? Five what by five what?"
Willow: "See, that's the thing. No one knows."

The Patty Duke Show was an ABC situation comedy which aired from September 1963 to August 1966.

--Melissa Lamb