Welcome to the Hellmouth (Season 1, Episode 1)

Cut outside later that evening. Buffy is walking down a dark street, when someone appears behind her. She senses that she is being followed. After walking for a ways, when she gets a chance she ducks down an alley and looks around for a place to hide. A cat yowls and kicks some cans as it runs away. She spies something above her. Angel comes into the alley but doesn't see her. As he slowly walks along, the camera pulls up to reveal Buffy in a handstand on a bar high above the pavement. When Angel has passed underneath her, she swings down and kicks him in the back. He is knocked to the ground, and Buffy positions herself above him with a foot on his chest.

Angel: Ah, heh. Is there a problem, ma'am?

Buffy: Yeah, there's a problem. Why are you following me?

Angel: I know what you're thinking. Don't worry, I don't bite.

She backs off and lets him get up, but keeps her fighting stance.

Angel: Truth is, I thought you'd be taller, or bigger muscles and all that. You're pretty spry, though. (massages his neck)

Buffy: What do you want?

Angel: The same thing you do.

Buffy: (lets down her guard) Okay. What do I want?

Angel: (steps toward her) To kill them. To kill them all.

Buffy: Sorry, that's incorrect. But you do get this lovely watch and a year's supply of Turtle Wax. What I want is to be left alone!

She starts a determined walk away.

Angel: Do you really think that's an option anymore? You're standing at the Mouth of Hell. And it's about to open.

She stops, turns to him and looks at him with a wide-eyed gaze. He reaches into his jacket and pulls out a small box.

Angel: Don't turn your back on this. (tosses her the box) You've gotta be ready.

Buffy: What for?

Angel: For the Harvest.

Buffy: Who are you?

Angel: Let's just say... I'm a friend. (starts to leave)

Buffy: Yeah, well, maybe I don't want a friend.

Angel: (turns back) I didn't say I was yours.

He leaves. Buffy stares after him for a moment, then opens the box. It contains a silver cross and chain. She takes it out, holds it in her hand and takes another glance in his direction.