This is how Discord corrupts Twilight goes in The Return of Harmony.
[We view Twilight (without her wings and horn) walking through the maze when Discord appears]
Discord: Princess Twilight.
Twilight Sparkle: Discord.
Discord: How long have you been walking?
Twilight Sparkle: A while.
Discord: Well, I wanted to ask you something.
Twilight Sparkle: What is it?
Discord: Take a look at this.
Twilight Sparkle: Okay.
[Discord shows Twilight a project of Optimus shoving Twilight aside]
Discord: Optimus Prime would only do that if you failed. But he was never your friend to begin with. He was your foe.
Twilight Sparkle: [gasps]
[Twilight's eyes become hypnotized]
Discord: And now I'm giving you the chance to exact your revenge on what he did to you.
Twilight Sparkle: Okay.
[A box appears]
Discord: That box contains your horn and wings. You can take them and become my Queen of Chaos or continue to wander around aimlessly through this maze. Your choice.
[Twilight turns colorless and her eyes return to normal]
Twilight Sparkle: I accept the honor of being your queen.
Discord: Good. [gives Twilight her horn and wings]
Twilight Sparkle: Optimus will pay.
[Meanwhile, Applejack, Pinkie Pie, Rarity (without her horn), Fluttershy (without her wings), and Rainbow Dash (without her wings), Starlight Glimmer (without her horn), Trixie Lulamoon (without her horn), and Thorax (without his horn and wings) are still wandering through the maze]
Pinkie Pie: Where is she?
Rarity: How are we supposed to know?
Fluttershy: Just keep looking.
Rainbow Dash: She could be anywhere.
[They see Twilight has her horn and wings and is colorless and is causing chaos]
Fluttershy: You're okay!
Rarity: We've been looking everywhere for you, darling.
Pinkie Pie: What happened?
Rainbow Dash: And why are you doing this?
Starlight Glimmer: Are you okay?
Trixie: This is madness.
Thorax: Who's responsible for this?
[Suddenly the maze disappears and Discord appears]
Discord: Well, looks like somepony broke my no wings, no magic rule. [gives Fluttershy, Rainbow Dash, and Thorax their wings back and gives Rarity, Starlight, Trixie, and Thorax their horns back]
Discord: And I can answer Rainbow Dash's question about why Twilight's causing chaos. Twilight Sparkle is my Queen of Chaos.
Rainbow Dash, Pinkie Pie, Rarity, Fluttershy, Applejack, Starlight Glimmer, Trixie, and Thorax: (together) What?!
Discord: That's right.
Rainbow Dash: You let her go.
Fluttershy: She will never bow to you.
Rarity: Nor will we.
Pinkie Pie: Release her!
Starlight Glimmer: Or else...
Trixie: We'll unleash the Magic of Friendship on you!
Thorax: And put you back in your stone prison.
Discord: I doubt it. We all know the Elements of Harmony can't work without the sixth. Isn't that right, my queen?
Twilight Sparkle: Yes, Discord.