The series of strips that starts here. Tiffany tricks Dirk into thinking Toni has moved away, which quickly turns into a game of Xanatos Speed Chess with some absolutely brilliant improvising on her part. Even though he later figured out she was lying, he was initially convinced she was being honest with him. Even Alpha Bitches have their moments.
Someone finally, FINALLY calling out Bratty Half-Pint Shannon on her behavior (in this case, Luann during a babysitting gig). Unfortunately, Luann's chewing-out was completely ignored by the kid. And Toni's response upon returning home was pretty much "Yeah, I know she's horrible. Why do you think I let you babysit her so often?"