The Adventure Time cast write self-insert MLP fanfiction, and have a lot of fun doing so. Problem is, the Adventure Time Cast being who they are, each one of them has a skewed understanding of Equestria and its people, and none of their disturbing, fantastic head-canons can agree. This fanfic has problems.

P.S. BP wanted to use "The most excellent and tragic account of the whimsical and serendipitous happenstance, whence the foremost diplomats of the Magical Kingdom of Ooo chanced upon the Equestrian Realm and its inhabitans, and with them forged friendship everlasting." as the story's blurb, but it got shot down by everyone else on the grounds of being boring, and going overboard with the big words.