[EDIT: March 3, 2019 Changed the title from "The Diary of the Pink Mare" to "Pinkie's Journal". Also needed to fix some grammatical errors. Sorry about that.]
Pinkie Pie. A name beloved by many ponies in Ponyville. She makes parties and makes everyone happy. She doesn't stop for reason...
It was a depressing time for the planet known as Earth. Germany took control of Poland, France surrendered, Russia was having tough times, South Pacific Islands like Manchuria, India, and the Philippine Islands were invaded by the Imperial Japanese soldiers, and the screams of the numerous people were heard throughout World War II.
A soldier serving the Allied Forces during the Normandy Landings was killed after they had gotten past German defenses. Though he had died, he was given another chance at life; to leave the depressing time and go in to a more colorful life. Specifically in a pinkish color in the form of a pink mare.
All is revealed when Rainbow Dash decides to pull a prank on that same day by sneaking up on her as a joke during the date of her birth... the date of his death.