This is how Going to the Human World goes in The Great Equestria Girls Adventure.
[Luna takes them to the mirror]
Princess Luna: This mirror is a gateway to another world. It opens every 30 moons.
Pinkie Pie: Sparkly!
Lewa: This is amazing.
Princess Luna: It has always been kept in the throne room of Canterlot Castle. But when Princess Cadance took over the Crystal Empire, we sent it here for her to watch over.
Princess Celestia: I hoped that Umarak would use it to seek my guidance but that is not what has happened.
Princess Cadance: Twilight, you must use the mirror to go into this other world and retrieve your crown. Without it, the other Elements of Harmony have no power and Equestria is left without one of its most important means of defense.
Princess Luna: Your crown does not belong in the place Umarak now calls home. And in his possession, your Element of Harmony will no doubt be used to bring harm to the inhabitants of this other realm. They will not have the power to defend themselves.
[Twilight's bags are placed on her back]
Princess Celestia: You understand the importance of your task?
Twilight Sparkle: Of course.
Princess Celestia: Good. Then you must go at once.
[Twilight starts to move but Rainbow Dash blocks her way]
Rainbow Dash: Whoa, whoa, whoa! She's going, we're going with her.
Pinkie Pie: [squee]
Rainbow Dash: Right, girls?
Pinkie Pie: Oooh! I'm so 'nervicited'!
Lewa: I agree.
Applejack: You do realize that's not a real word, right?
Princess Celestia: I'm afraid I can't let you go. Optimus Prime will go with Twilight.
Rainbow Dash: What?! Why not?!
Princess Celestia: Sending all of you could upset the balance of this alternate world, creating havoc that would make it impossible for Twilight to get the crown back from Umarak. This is something Princess Twilight and Optimus Prime must do alone.
Princess Luna: Time is of the essence. On the third day, when the moon reaches its peak in the night sky, the gateway will close. And once it does, it will be another thirty moons before you will be able to use it to return.
[Twilight and Optimus step through the mirror. An anxious Spike shortly follows]
Main Six, Autobots, and Toa: Spike! No!
[Spike jumps into the mirror]
[Twilight, Optimus, Tahu, and Spike tumble through the portal. On the other side, Twilight becomes a human and Spike becomes a dog while Optimus stays the way he is and Tahu remains himself]
Spike: Twilight? Optimus? Tahu?
Twilight Sparkle: Spike? You're not supposed to... [gasps spotting him] Spike? Are you a... dog?!
Optimus Prime: He is. And you are a human.
Tahu: I can see that.
[Twilight looks at her hooves and finds out they've turned into hands]
Twilight Sparkle: [screams]
Optimus Prime: Twilight, calm down.
Tahu: Calm down.
Twilight Sparkle: What... does the rest of me look like?!
Optimus Prime: You. Only not you. Your muzzle's shrunk into a nose.
Tahu: He is right.
Twilight Sparkle: My muzzle? [panics but Optimus covers her mouth]
Optimus Prime: Are you going to scream again?
Twilight Sparkle: [shakes her head for no]
Optimus Prime: [uncovers her mouth] Good.
Twilight Sparkle: I'm glad I'm still me. Just my whole body seems drifferent.
Optimus Prime: So what? I'm still me.
Tahu: I'm me too.
[Twilight notices Optimus is still himself]
Twilight Sparkle: How?
Optimus Prime: Well, I just portal transformation does not work on Transformers.
Tahu: Or Toa.
Twilight Sparkle: Portal transformation?
Optimus Prime: Never mind. Where are we anyway?
Tahu: I have not seen this place before.
[Twilight, Optimus, Tahu, and Spike look around them]
Twilight Sparkle: But that must serve as the gateway back to Equestria. We need to find my crown as soon as possible and get back there. I suggest we start searching the castle first.
Optimus Prime: Right.
Tahu: Good plan.
Spike: Works for me. Yeah, I don't think that's how the new you is supposed to–
[Twilight stands and struggles to mimic Optimus and Tahu]
Twilight Sparkle: Whooaaa... Whoa! Ooh... [laughs nervously] C'mon, Spike. I do not wanna be like this for longer than I have to.
Optimus Prime: [rolls his eyes]
Spike: Well, look on the bright side. You don't have those pesky wings to worry about anymore.
[Twilight tries to open the door but can't]
Twilight Sparkle: Hmm! [grunts] [gasps] My magic! It isn't working!
Spike: Makes sense. You don't exactly have your horn.
Optimus Prime: Sentiment beings don't use magic in this world.
Tahu: He has a point.
Twilight Sparkle: What?!
Spike: We really need to find you a mirror.
[They go inside]
Twilight Sparkle: What do ya think, guys? Other artifacts he's stolen from Equestria?
Optimus Prime: These aren't artifacts, Twilight.
Tahu: They're called trophies.
[Twilight looks at her reflection in the glass]
Twilight Sparkle: [gasps] What am I?
[A bell rings and dozens of humans pour into the hallway. Optimus, Tahu and Twilight struggle through the crowd]
Twilight Sparkle: Huh? [collapses on the floor with Optimus and Tahu] Oof!
[A humanized Flash Sentry looks at them]
Flash Sentry: Whoa. You okay?
[He helps them up before leaving]
Spike: I don't think this is a castle.
[Twilight and her three companions look around]
Twilight Sparkle: I've never seen a place~
That's quite like this~
Everything is turned around~
This crazy world is upside-down~
Getting on my feet~
It's the hand that I was dealt~
But I don't have much time with them~
Got to learn all that I can~
They don't use any magic or fly with any wings~
I don't get these funny clothes, skinny legs, or tiny nose~
Everything's confusing when it seems so new~
But I look a little closer and it starts to feel familiar too~
What a strange new world (what a strange new world)~
I'm trying to make heads or tails of this strange new world (what a strange new world)~
Sorting through the small details of this strange new world~
What a strange new world~
[Twilight, Optimus, Tahu, and Spike hear something]
Fluttershy: Oh, I'm really sorry. I-I just found it, and-and I thought I should give it to her. I didn't know you had dropped it.
Sunset Shimmer: You leave my friend alone!
Umarak the Hunter: Well, I did! And I was about to get it before you swooped in and ruined everything! You shouldn't pick up things that don't belong to you.
Fluttershy: [hushed] It... doesn't really belong to you, either.
Sunset Shimmer: I could tell you the same thing, you jerk!
[Umarak pushes them back against a locker]
Umarak the Hunter: Excuse me?!
Sunset Shimmer: Shut your mouth, you dirty bone hunter!
Umarak the Hunter: That's what I thought. It's as good as mine, and you know it. You really are pathetic. It's no wonder your best friends are all stray animals.
[Twilight, Optimus, and Tahu come up behind]
Twilight Sparkle: How dare you speak to them that way!
Optimus Prime: You back off from them this instant!
Tahu: Or else!
Sunset Shimmer: Fluttershy, are you seeing what I think I'm seeing?
Umarak the Hunter: What did you say?
Twilight Sparkle: I said, "How dare you speak to them that way!"
Optimus Prime: You just assualted two inoccent humans.
Tahu: So if you want a piece of us, you'd better back off. Or else!
Sunset Shimmer: Yeah! You heard them!
Umarak the Hunter: You must be new here. I can speak to anyone any way I want. [glares at a teenager who hides in his locker before moving on]
Umarak the Hunter: You all care for each other?
Twilight Sparkle: Yeah.
Optimus Prime: That is what keeps us bonded.
Sunset Shimmer: And friends that care for each other stay together.
Umarak the Hunter: It makes you weak.
[A circle of darkness appears and Umarak walks into it and disappears into the shadows as the circle of darkness disappears]