I'll go first.

Season 1 Episode 4: Magic Bullet

If you go to her house today and squander that colossal opportunity, I swear to God I'll have you de-balled.

Season 2 Episode 10: Fury

Mr. Stilinski: Why would this kid want most of the 2006 swim team and its coach dead?

Stiles: Isn't it obvious? Our swim team sucks. They haven't won in like six years.

Season 1 Episode 3: Pack Mentality

Stiles: “Why's it starting to feel like you're Batman and I'm Robin? I don't wanna be Robin all the time!”

Season 2 Episode 8 Raving

Stiles: I'm 147 pounds of pail skin and fragile bones. Sarcasm is my only defense.

Season 3 Episode 10 ‘The Overlooked’

Stiles to Cora: “You know, the next time I put my lips to your mouth, you better be awake.”

Season 1 episode 9: Wolf's bane

Danny: (talking about Derek) Who is he again?
Stiles: Ah, My cousin...Miguel

Season 1 Episode 1

Stiles to Scott : "You wouldn't answer your phone! Why do you have a bat!?"

Season 1 Episode 9

Stiles: You swing for a different team but you still play ball, don't ya Danny boy.
Danny: You're a horrible person.
Stiles: I know. It keeps me awake at night.

I have 2 that I like and there both from season 1 episode 1

Scott- A dead body?!
Stiles- No a body of water. Yes you dumb ass a dead body!

Scott- Stiles! What the hell are you doing!
Stiles- You didn't answer any of my calls! Why do you have a bat?
Scott- I thought you were a predator!

Stiles: » ..not all of us can be true alphas, some of us have to make mistakes. some of us are human.. «