Five words: Pinkie Pie in Sugar Rush. You can easily tell how that ends up.
When Pinkie meets most of the racers in Sugar Rush, she starts to imagine them as candies, Hilarity Ensues as she begins to attack the racers and its citizens as she tries to eat them.
Expecially after she spits out Sour Bill, he comments so he was violated once again and runs off crying.
After Vanellope is told of Pinkie Pie antics, she at first laughs at the claims wondering how a horse can do such damage, then it cuts as she stares in shock at the damage Pinkie did.
What does Pinkie do after Vanellope tells her to leave?, she simply licks her.
Ralph's "Really?" after he simply sees Pinkie trying to take a bite from an jawbreaker. After Vanellope told him that Pinkie was causing havoc on Sugar Rush.
While running away from Ralph, Pinkie breaks the fourth wall as she gets out of the video and lands on the Youtube page, as she switches to an Deadpool video, Deadpool notices this and switches back to the Wreck-It Ralph meets My Little Pony video.
Pinkie screaming like a pig and shooting at Ralph with her Party cannon.
Lyra and Bob Bon getting barfed accidentally by Pinkie Pie.
The confused reactions of the sisters as they see all these. When they get to Prince Hans, however, he notices the sisters and growls angrily at them and the sisters react with angry glares back at him.
In that same video, after Applejack pulls a Get A Hold Of Yourself Man on her, Twilight replies with, "did you just smack a princess?"
Applejack: Yes, and I'll do it again! (smacks her again, before moving on)
When Pinkie Pie returns from Arendelle, she brings back Olaf as a souvenir. When he starts talking, Twilight freaks out and knocks his head off, which lands right in front of baby Flurry Heart.
Olaf: Oh my gosh, it's a little baby unicorn. (Flurry Heart sticks the head in her mouth) Aw, she likes me.
After hearing Twilight tell Applejack to convince them to work faster, the other ponies start throwing stuff at Applejack, including the Mayor, but she ducks and misses them all. Applejack then makes a face at the others, only to get flattened by a boulder. The next scene shows Applejack with a pack of frozen peas on her head.
Minuette starts to feel dehydrated from working so much. Then she remembers that snow is water and starts eating it. When Doctor Whooves asks if he can have some snow too, Minuette snarls at him.
When all of the ponies are cheering for Elsa, Minuette can be seen with a Balloon Belly.
Freddy: Hey Hockey Puck, this is my "MLP meets" short, not yours. So go make another sequel and get lost!
Princess Celestia is summoned by Sofia the First to help her with a problem she's having. Is it a friendship problem? Is Sophia having jealously issues? Nope. She just needs help opening a pickle jar. Of course, Celestia is not happy.
Celestia: So I was summoned here, with very important stuff on my hooves mind you, just to open a jar of STUPID PICKLES?!