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Welcome to the Hellmouth/The Harvest:  "Can you vague that up for me?" - Welcome to the Hellmouth

The Witch:

Teacher's Pet: "Destructo-Girl, that's me."

Never Kill A Boy on the First Date:

The Pack:

Angel:

I Robot, You Jane:

The Puppet Show:

Nightmares:

Out of Mind, Out of Sight: "I think I speak for everyone here when I say, 'Huh?" - to Giles.

Prophecy Girl: "I may be dead, but I'm still pretty. Which is the least I can say for you." - to the Master

Welcome to the Hellmouth/The Harvest:  "So, all the city plans are just, uh, open to the public?"  -Giles, "Um, well, i-in a way. I sort of stumbled onto them when I accidentally decrypted the city council's security system." -Willow, The Harvest.

The Witch:

Teacher's Pet:

Never Kill A Boy on the First Date:

The Pack:

Angel: "So he is a good vampire. I mean, on a scale of one to ten, ten being someone who's killing and maiming every night and one being someone who's...not."

I Robot, You Jane:

The Puppet Show: "Once again, I'm banished to the demon section of the card catalog."

Nightmares: "I don't like spiders, okay? Their furry bodies, their sticky webs- what do they need all those legs for anyway? I'll tell you: for crawling across your face in the middle of the night. Ew."

Out of Mind, Out of Sight:

Prophecy Girl: "I'm not okay. I knew those guys. I go to that room every day. And when I walked in there...it wasn't our world anymore. They made it theirs. And they had fun." - to Buffy

Welcome to the Hellmouth/The Harvest: "Okay this is where I have a problem, see, because we're talking about vampires. We're having a talk with vampires in it." - The Harvest

The Witch: "For I am Xander, king of cretins. May all lesser cretins bow before me."

Teacher's Pet: "Can I just say one thing? HEEELLLLPPP!"

Never Kill A Boy on the First Date: 

The Pack:

Angel:

I Robot, You Jane:

The Puppet Show:

Nightmares:

Out of Mind, Out of Sight:

Prophecy Girl:

Welcome to the Hellmouth/The Harvest: "Alright. The Slayer hunts vampires, Buffy is a Slayer, don't tell anyone. Well, I think that's all the vampire information you need" - The Harvest

The Witch:

Teacher's Pet:

Never Kill A Boy on the First Date: Giles: "Two more of the Brethren were here. They came after me, but I was more than a match for them." Buffy: "Meaning?" Giles: "I hid"

The Pack:

Angel:

I Robot, You Jane:

The Puppet Show:

Nightmares:

Out of Mind, Out of Sight:

Prophecy Girl:

Welcome to the Hellmouth/The Harvest: "She did it! I'll be damned!" - The Harvest

Teacher's Pet:

Never Kill A Boy on the First Date:

Angel: "If I can go a little while without being shot or stabbed, I'll be okay."

Out of Mind, Out of Sight: "Don't worry, I'm not here to eat."

Prophecy Girl: