Buffy and Giles in “Faith, Hope & Trick”

[about Kakistos] Now, this guy shows up two days ago, right? Right around the same time my bestest new little sister makes her scene.

You think he and Faith are connected?

Giles, there are two things that I don't believe in: coincidence and leprechauns.

Well, Buffy, it's entirely possible that they both arrived here by chance simultaneously.

Okay, but I was right about the leprechauns, right?

As far as I know, yes.