Applejack finds a strange visitor in her apple orchard one day, with even stranger stories to tell...
MLP/L4D2 crossover. My first story on FiMfiction.net! May add more tags as story progresses.
Credit for the image goes to brokencreation on DeviantArt.

There was only one explanation. For all of it. All of the strange, erratic behavior. Her irrational fear of the sun. Her nocturnal habits of locking herself in in the dark and closing all the blinds. Wearing her sunglasses everywhere, even inside! It was time to invest in some silver, garlic, and a wooden stake.

One cold autumn night, Twilight Sparkle lets in a pale and weary traveler into her home. When she accidentally discovers his dark secret, she is assaulted by him, and is left to die... When she woke up, she finds that she has been turned into a Vampire, an ancient enemy of Equestria last seen during Nightmare Moon's Rebellion. She now walks the thin line between life and death, sustained only by the blood of others.

Her friends now race against time to find a cure for this ancient curse, and stop the Vampire who infected Twilight, before he can create a new army of Vampires to conquer Equestria. Otherwise, Twilight will join the forces of evil and darkness, as the Bride for the Lord of Vampires. They have to work quickly, as every day passes, Twilight's thirst for her friends' blood increases...

Fluttershy has a secret. She has developed an obsession with heavy metal music. However, Fluttershy can't let her friends know that a nice, timid pony such as herself loves such aggressive music, no matter what the costs. It simply isn't lady-like.

Artemis Fowl the Second. Middle School Student. Eccentric Billionaire Mastermind. Well, that's what he was a year ago. After the disappearance of his father when his yacht was destroyed while shipping hundreds of thousands of cans of cola to Russia, and the loss of a considerable chunk of his family fortune, he has been hunting for a way to gain his wealth back. And his search has lead him to a world of peace, harmony, and magic. And he has plans for it. With his butler, Butler, and Butler's sister Juliet, he delves into the world where his honor, family, and most importantly, fortune, can be restored.

This is a "what if" scenario if Artemis Fowl decided to seek fortune in Equestria instead of with the People. Sincere thanks to jasontaylorblogs for proofreading and providing feedback, as well as Eoin Colfer for creating this wonderful series.

I don't own MLP, or the Artemis Fowl series, though I do own a few cucumbers.