"Guilty, guilty and oh so guilty of being the new Big Man of crime!"
In the first season finale of Beast Wars, Optimus is piloting a stasis pod set to self-destruct towards this big planet-destroyer. The plan is for him to blow the doors and zoom out before the explosion.
Optimus: "All right, it's time. Computer, prepare to blow the pod doors." Computer: "Negative. Pod doors are magna-sealed." Optimus: "That's... impossible." Megatron's voice comes out of nowhere over the speaker: "Oh. I assure you. It is not." Moments later... BOOM!
"Coming of the Fuzors, Part 2" sees the Maximals about to be destroyed by the Predacons. Cue a Big Damn Heroes moment from an unexpected source.
Queen of the Crown: "I know all about you, Ranger Foxx." (as the Slaverlord behind him takes on the form of his wife) Senator Whiner: "Walsh! I know where Gooseman's genetic models came from."
Zhao: I assure you, I have everything under control. I intend to remove the moon as a factor. ("Siege of the North, Part 2") Iroh: You have two grandfathers, Prince Zuko. Fire Lord Sozin was your father's grandfather; your mother's grandfather was Avatar Roku. ("The Avatar and the Fire Lord")
Jackie Chan Adventures season 2 episode 1 episode "The Stronger Evil" has this exchange:
Finn: We must've left millions of dollars back on that beach. What's the matter with you, Big V? Shendu, possessing Valmont's body: Valmont cannot hear you right now.
"You're Getting Old": "Because I'm unhappy, okay?! I've been unhappy for a long time!"
"Scott Tenorman Must Die":
Scott Tenorman: I'm glad you like [the chili] so much, because now that you're almost finished I have something to tell you. Cartman: What? You mean about how you put pubes in your chili?
And later:
Cartman: Do you like it? Do you like it, Scott? I call it "Mr. and Mrs. Tenorman chili".
In "201", The Reveal of the Head Ginger's identity is directly preceded by this line:
Scott Tenorman: Welcome to my Chili Con Carnival!
In one of the most memorable scenes of Turtles Forever, what started off as a simple crossover movie escalates into a Crisis Crossover with this:
Scott Summers/Cyclops: (pulling Professor X from his wheelchair) It was YOU! YOU did this! Professor X: (laughing, as Mystique's voice emerges) Yes, I did it.
(Professor X changes into Mystique) Mystique: And now, it's about to get much worse.
Red Tornado:Unfortunately, the Roy Harper we have all known for the last three years is another Cadmus clone.
And from "Happy New Year", FIVE YEARS LATER
From "Bloodlines":
Bart Allen: "Better get into character."
Subverted nicely, in "Depths".
Nightwing: She's Dead.
And
Nightwing: We'd laugh about this some day.
For context, Nightwing asks Artemis to rejoin the team. On the mission, they fight Aqualad who has already been revealed to have made a Face Heel Turn, who stabs her in the chest with the line "Welcome Back." After the second wham line, it's revealed to have been a ruse and Artemis is in fact alive, and Aqualad never really made a Face Heel Turn
From the "Super Powers Team" incarnation of Superfriends, the episode "Darkseid's Golden Trap":
Superman: Good luck, my friends, I'm sorry I can't join you. Black Vulcan: We understand, Superman, this is one mission that would be much too dangerous for you."
Even the Narrator is puzzled at what sort of mission is so dangerous that Superman himself has to sit it out; It's an Auction of Evil where one of the lots is a piece of gold kryptonite, which the heroes have to confiscate before it can be used against Superman.
