Trevor Phillips is mentioned in this, as a inside joke from TREVR PHILLIPS SERIES. Cause Pinkie Pie was involved as Trevor's henchmen (Cupcakes version of her)..

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Starlight Glimmer, newly accepted student to Princess Twilight Sparkle, tries finding her way around the large 城堡 of Friendship. Upon finding Twilight in the 城堡 library, Starlight thanks Twilight for letting her stay at the 城堡 after everything she's done in the past. Twilight tries to help Starlight feel welcome, and as Starlight's teacher, she tries to figure out what her first friendship lessonshould be, having made extensive lists of possibilities.

Starlight: Right. Uh.. Is Saten here?

Twilight: He 说 he's on his way.. First he 说 he and Derpy had to do something.

MEANWHILE:

Derpy: I.. I don't know about this Saten.. This place is giving me the creeps.

Saten: Relax, it'll be fine.. (knocks on the door to a old, rusty looking, trailer).

Trevor Phillips: (opens his door) Hello?

Saten: (holds contact) Hi, do 你 mind signing this contact to legalize wee-

Trevor: (suddenly punches Saten scare in the nose, knocking him off the steps and onto the ground) I make a SHIT load of money selling that stuff! Last thing I can handle is legalism, NOW FUCK OFF!

Saten: (holding his nose as Derpy helps him up) 你 could of just 说 no!

Trevor: What's the fun in that?

Saten: Your a dick.

Trevor: WHAT!?.. (pulls out gun) SAY THAT AGAI- (Suddenly there's an explosion from inside the trailer).

Trevor: DAMN IT MICHAEL! I TOLD 你 NOT TO SMOKE IN HERE!

Michael: (off view) Eh, shut up!

Saten: Who's your friend?

Trevor: Why are 你 still here!? FUCK OFF!

Saten: (angrily) 你 fuck off.

Derpy: (nervously grabs leaves) Cousin, the guy has a gun.

Saten: Yeah, well I bet it's not real (gets nearly shot) LEAVING! (he and Derpy run off).

Trevor: (sighs and goes back inside his house) Stupid 小马 references.. I hate this fuckin writer!