Why did Pinkie go insane, and turn into Pinkamena? It all goes down to pegasus pony from Cloudsdale; Surprise. After she came to Ponyville, she started to replace Pinkie. Even the mane 5 seemed to replace Pinkie. It wasn't long until Pinkie snapped..
It is all thanks to Luna and the vision she dropped on my head that one fateful night. Now I have a choice and a mission to carry out. Only someone is about to lose his head over it.
This adventure started out with a flat mane, and the notion of beaming. Now you see a community of smiling Ponies, and I hope they will. Only this isn't so much of ponies, but myself, and the once living on the other side.