"The enemy of my enemy dies next."
"And here I thought I'd had my quota of betrayal and attempted murder this year...."
— Garrus, Mass Effect 2
"He is what they call in the thrillers a double agent, a triple agent in this case, and agent to infinite regression..."
— Sol, Hyperion
Niko: That is the plan, Jacob. I will put a bullet in his heart for every life he ruined, for every agreement he went back on, for every friend he betrayed.
Jacob: Dat be a whole heap of teeth, ya know, Niko. I don't tink we have enough ammo fe shoot him dat many times, ya know.
Niko: Perhaps one bullet in his brain will have to do then.
Elizabeth: Whose side is Jack on?
Will: At the moment?
— Pirates of the Caribbean: At World's End
Drizz'l: Hold it. What do you think you are doing here?
Black Mage: I'd say I was joining the winning team, but that would imply there existed a time where I wasn't on Team Evil.
"If his treachery could ever hurt anyone more than himself, I'd have to stop him."
"Who could be foolish enough to relax his guard with a man who constantly betrays everyone around him?"
— Sir Bismarck Waldstein, Code Geass
"Damn, but I'm gonna need a lot of this..."
"So now you're with Konoha? You guys sure keep busy, switching sides all the time!"
— Tayuya, Naruto
"I did warn you not to trust me, you know."
— Petyr "Littlefinger" Baelish, A Song of Ice and Fire
"Diplomacy is the art of saying 'Nice doggie' until you can find a rock."
— Will Rogers
Sheva: I thought they were partners?
Chris: Wesker doesn't give a damn about anybody but himself.
"That thieving lizard Shendu will pay dearly for his betrayal!"
— Daolan Wong, Jackie Chan Adventures
Gather round while I sing you of Wernher von Braun
A man whose allegiance is ruled by expedience
Call him a Nazi, he won't even frown
"Nazi Schmazi", says Wernher von Braun
— Tom Lehrer, "Wernher von Braun"
"Is it my fault that you are so trusting?"
— Mozenrath, Aladdin: The Series
"I know to whom I owe the most loyalty, and I see him in the mirror every day."
"Because that's what Shawn Michaels generally does."
— John Cena, asked why he thinks his tag partner is going to backstab him.
"But fortunately I anticipated your anticipation of my anticipation of your anticipation of my anticipation of your anticipation of my treachery!" cried Zarkendorf.
— Plan 7 of 9 from Outer Space by Odon
"What? Naesala and the ravens of Kilvas betrayed us? Again?"
— Ranulf, Fire Emblem: Radiant Dawn
"Treachery keeps the wits sharp."
— Megatron, Beast Wars
"Curse your sudden but inevitable betrayal!"
— Wash, Firefly
"You want to kill me, don't you, Tucker? Well take a number and get in line."
— Eric Qualen, Cliffhanger
"Trust not a man who has betrayed his master, nor take him into your own service, lest he betray you too. I learned the truth of this, to my sorrow, the day we arrived in Azahd as the Sultan's honoured guests.