I don't have a particularly good memory for lines from tv shows, but sometimes the lines are so good I remember them (or cheat and write them down).
In no particular order, here are some of my favourite lines:
Veronica: [smells and shakes envelope] A pony?!
Veronica: I'm so impressed you fit a pony into my room.
Spike: Out. For. A. Walk. Bitch.
Ianto: Mobiles, landlines, tin cans with bits of string. Everything, absolutely everything. No phones. Phones all broken. Hello? Anyone there? No. Because the phones aren't working.
Spike: [as Rachel] How can I thank you, you mysterious black-clad hunk of a night thing?
Spike: [as Angel] No need, little lady, your tears of gratitude are enough for me. You see, I was once a badass vampire, but love and a pesky curse defanged me. And now, I'm just a big, fluffy puppy with bad teeth.
[Rachel's about to touch Angel's hair]
Spike: No, not the hair. Never the hair.
Spike: [as Rachel] But there must be some way I can show my appreciation?
Spike: [as Angel] No, helping those in need's my job, and workin' up a load of sexual tension and prancing away like a magnificent poof is truly thanks enough.
Spike: [as Rachel] I understand. I have a nephew who's gay, so...
Spike: [as Angel] Say no more. Evil's still afoot. And I'm almost out of that nancy-boy hair-gel I like so much. Quickly, to the Angel-mobile, away.
Logan: I thought our story was epic, you know? You and me.
Veronica: Epic how?
Logan: Spanning years, and continents. Lives ruined and blood shed. Epic!
Dick: Shh! It's not me, it's Wu.
Dick: Put on your dancing shoes, Mars, 'cause tonight we're gonna up-chuck the boogie to the rhythm of the boogie to beat.
Veronica: Up... chuck?
Dick Casablancas: You heard me.
What are some of your favourite lines from TV shows?