A crossover with the SCP Foundation - Technically could be read without prior knowledge, but it is just a click away. Why not check it?

Twilight struggles through a slice of Pinkie's mind in the form of a manuscript of her authorship, featuring their lives and adventures through a very different and slightly terrifying perspective.

To what depths will Twilight be forced to plough through? And what is an SCP, and why does being a Brony make you one?