Well this aged well.  

Don’t worry, Pinkie’s FIXING the wing!

@Background Pony #247B  
“There’s a…pinkie…out on the wing”

@Background Pony #247B  
Me: Drat. I was just about to say that :P

THERES A PINKIE ON THE WING OF THE PLANE!

Seconds before  
Pinkie: there’s a mare on the wing!  
Rarity: what? looks, pinkie is out there  
Pinkie: it’s me, I’m the mare in the wing

And the Rarity has send into Ponyville Mental Hospital

@requiem-dirge  
“I’m sorry what were you saying?”

You better get a gun and shoot-to-kill, Rarity.
 
I love the “Twilight Zone.” The show, it’s famous twists, and suspense still holds up well even by today’s standards.

@FancyCat2008  
rarity is slightly less hammy

Pinkie! You’ve doomed us all!! D:

Madagascar is Madagascar.

@FancyCat2008  
I was just imagining that… It actually does sort of work for little miss drama queen.
 
And, it was, THE,. WORST,.. POSSIBLE,… THING!

This is brilliant

R: “Sweet Celestia! It’s a storm of Mirror Pinkies!”

a plane pony’s worst nightmare…

And then suddenly Rarity started talking like William Shatner.

“There’s…someone on the wing. Some…THING…”

“Hi, Rarity! Enjoying the flight?”

This is a good one, especially sense it’s easy to imagine Rarity in that role. She can be as hammy as Shatner, and does have a tendency to go a bit crazy at times.
 
@gasmaskangel  
Yeah, even if it looked fake by today’s standards, but in a way it was a bit uncanny valley/creepy to for it’s day. They had a scarrier version of the monster/gremlin in the remake in the “Twilight Zone Movie,” but I kinda prefer the older cheesier one.
 
@sumbozo  
They had a hilarious joke about that when those 2 actors were on “3rd Rock from the Sun” together. (Awesome ‘90s sitcom, shame it’s forgotten lately…)

Wow “nightmare at 20000 feet” is a tag.

“There’s some… thing on the wing!”

“Sir! There’s a pony on the wing!”
 
“Why should I believe you? You’re Nightmare Moon!”
 
“AAAAAAAAAAAAAAAAAAAAAHHHHHHHHH!!”