Image imported from derpibooru 
Original Description:
 
This was difficult to draw cause I imagine the 7D are the same size as Spike.
 
Twilight Sparkle: Well, we couldn’t stop him from shrinking Jollywood, but we did discover his weakness. And we can use that to save Jollywood and get Doc’s hat back. (looks at Grumpy) But…
 
Grumpy: I know what we gotta do, and I really don’t it. (to Happy and Pinkie) Happy. Pinkie. We need you two to sing your most annoying song ever!
 
Pinkie Pie: Oh, and what luck, we do have a most annoying song ever. There’s just one problem.
 
Happy: That song would require backup singers and you and Twilight aren’t enough.
 
(the 4D and Mane 4 arrive)
 
4D: (harmonizing) Hi-hi-hi-Howdy doodley do…
 
(Twilight and Grumpy look at each other before smiling slyly)
 
(cut to Jingleheimer put Jollywood in the train set)
 
Dr Jingleheimer: Delicately…delicately…(fits Jollywood in) Look how perfectly it fits! My Enchanted Forest play set it complete!
 
Pinkie Pie: (off screen) Oh, Jingleheimer…
 
(Grumpy, Twilight, Happy and Pinkie poke their heads out from the right side of the door frame)
 
Twilight Sparkle: (in sing song) We’ve got something to show you…
 
Dr Jingleheimer: Like what?
 
 
6D and Mane 6: (harmonizing) Oh-oh-oh…
 
(the Mane 6 trot around the lab with the 6D on their backs)
 
6D and Mane 6: This is the song
 
that gets on everybody’s nerves.
 
Everybody’s nerves.
 
Everybody’s nerves.
 
(tiny Queen Delightful and Lord Starchbottom dance arong happily)
 
This is the song
 
That gets on everybody’s nerves
 
And this is how it goes.
 
Dr Jingleheimer: (covering his ears) No, that song! It’s the most annoying song ever! Whaahh!
 
Bingo: (covering his ears) It’s burning into my brain!
 
Dr Jingleheimer: Ah, those lyrics combined with that sappy music and that makes me crazy!
 
Bingo: It is so lousy and ragment too!
 
(Twilight flies up and takes Doc’s hat in her mouth and gives it back to him and he frees himself with it)
 
Doc: Welcome back, hat, do your thing.
 
(the hat shrinks Jingleheimer and Bingo and puts them in the toy train)
 
Bingo: We’re tiny, master.
 
Dr Jingleheimer: (sarcastically) Thank you, Mr States the Obvious. And that’s why we call you Bingo, cause everything you say is spot on.
 
Bingo: I need to be precise.
 
Dr Jingleheimer: (secretly) What you really need is teeth whitener.
 
Doc: Hat, unshrink Jollywood.
 
(the hat unshrinks Jollywood and puts it back where it goes)
 
 
6D and Mane 6: And this
 
Is how
 
It
 
Goes.
 
Queen Delightful: Yippee!
 
Starchbottom: Yah!
 
 
7D: Yip, yip-yeeray!
 
 
(cut to Jingleheimer and Bingo driving the toy train)
 
Dr Jingleheimer: All aboard. Whoo-whoo!
 
Bingo: I like working on the railroad.
 
 
Happy: Oh I’ve been
 
Working on the railroad
 
Happy, 6D, and Mane 6: All the live long day…
 
7D: hi ho.