The episode "Checkpoint," where after a full episode of being made to feel inferior by the Zen Survivor Watcher's Council, the ditziest Big Bad ever to appear on the show, and a crazy Knights Templar army of Well-Intentioned Extremists, Buffy gives a perfectly calm, almost deadpan set of demands to the council's lead Deadpan Snarker, punctuated by a thrown broadsword. This troper's roommates' ears are still ringing from his cheering. The scene in all its awesomeness:
Quentin Travers: "We can begin the review at last. We'll skip the more obvious questions-"
Buffy: [places sword over his notes] "There isn't gonna be a review."
Buffy: "No review. No interrogation. No questions you know I can't answer. No hoops, no jumps, [Nigel opens his mouth to speak, Buffy turns to him] and no interruptions. [begins pacing] See, I've had a lot of people talking at me the last few days. Everyone just lining up to tell me how unimportant I am. And I've finally figured out why. Power. I have it. They don't. This bothers them. ...Glory came to my home today."
Giles: "Buffy, are you-?"
Buffy: "Just to talk. She told me I'm a bug, I'm a flea, she could squash me in a second. Only she didn't. She came into my home and we talked. We had, what in her warped brain, probably passes for a civilized conversation. Why? Because she needs something from me. Because I have power over her. You guys didn't come all the way from England to determine whether or not I was good enough to be let back in. You came to beg me to let you back in. To give your jobs, your lives, some semblance of meaning."
Nigel: "This is beyond insolence-"
Buffy: [flings broadsword, which just barely misses him] "I'm fairly certain I said no interruptions."
Xander: [whispers] "That was excellent."
Buffy: "You're Watchers. Without a Slayer, you're pretty much just watching Masterpiece Theatre. You can't stop Glory. You can't do anything with the information you have, except maybe publish it in the Everyone Thinks We're Insane-O's Home Journal. So here's how it's gonna work. You're gonna tell me everything you know. And then you're gonna go away. You'll contact me if and when you have any further information about Glory. The Magic Shop will remain open. Mr Giles will stay here as my official Watcher, reinstated at full salary-"
Giles: [coughs] "Retroactive."
Buffy: "-To be paid retroactively from the month he was fired. I will continue my work with the help of my friends-"
Lydia: "I-I-I... don't want a sword thrown at me, but-but civilians, I - we're talking about children."
Buffy: "We're talking about two very powerful witches and a thousand-year-old ex-demon."
Anya: "Willow's a demon?!"
Phillip: "And the boy? No power there."
Buffy: "The boy has clocked more field time than all of you combined. He's part of the unit."
Willow: [whispers] "That's Riley-speak."
Xander: [whispers back, grinning] "I've clocked field time."
Buffy: "You all may be very good at your jobs. The only way we're gonna find out is if you work with me. You can all take your time thinking about that. But I want an answer right now from Quentin, 'cause I think he's understanding me."
Quentin: [clears throat] "Your terms are... acceptable."