This is how Thunderwing lies to Twilight about her friends goes in Thunderwing's Return.
[Thunderwing brings Twilight to a floating crystal]
Twilight Sparkle: What's this?
Thunderwing: The Truth Crystal. Through it you can see the truth about your friends.
Twilight Sparkle: Okay.
Thunderwing: The Truth Crystal will show you how your friends really feel about you.
Twilight Sparkle: And what else?
Thunderwing: Their plans to shun you and reject your friendship.
[Twilight looks into the Truth Crystal and sees Rainbow Dash, Pinkie Pie, Rarity, Applejack, and Fluttershy at the Castle of Friendship]
Rainbow Dash: [in crystal] Sorry, Twilight, but you had a good run.
Pinkie Pie: [in crystal] We can't trust you anymore.
Rarity: [in crystal] We've had enough of you.
Applejack: [in crystal] We never should've accepted you in the first place.
Fluttershy: [in crystal] You're a disgrace to all of Equestria.
[Rainbow Dash, Pinkie Pie, Rarity, Applejack, and Fluttershy disappear as Twilight looks upset]
Twilight Sparkle: [gasps] My friends turn on me?
Thunderwing: Yes. Now, it's time to make them pay for doing this to you.
Twilight Sparkle: I'm gonna make them regret this.
Thunderwing: That's my little pony.
Twilight Sparkle: I'll show them what happens when they shun and reject me.
Twilight Sparkle: No one ever shuns and rejects me.
Thunderwing: And don't worry, I'll be your friend.
Twilight Sparkle: [as her eyes turn red] Excellent.
Thunderwing: [unfurls his wings] Now, my friend, let's go make them pay.
Twilight Sparkle: [unfurls her wings] Yeah.
[They take off]