As far back as I can remember, I had always wanted to join the CBI (Canterlot Bureau of Investigation). The funny thing is, if they had told me beforehand what I'd be getting into, I probably wouldn't have joined in the firs place. Anyways, the story starts off a little something like this...

The new mass-teleport-gateway was designed to revolutionize the future of travel in Equestria. What it ends up becoming, however, is not a gateway to the future, but a window to the past.

A mysterious artifact has switched the brains of the honest farm pony, Applejack, and the spastic party-pony, Pinkie Pie! How will they handle living in each others bodies? Will they be able to return to their rightful places? Will the Apple family barn inevitably sustain massive property damage?

In this alternate dimension, the land of Equestria is a dark and dangerous place filled with humans! Follow the adventures of the brave heroes who are the equivalent of the Mane six on their quest to restore balance and order to this strange and wonderful land through the power of brotherhood!

*note* I am just a little unhappy with how this story turned out, but I have no doubt that there is someone who could make a much better version. That said, if you can build off of the premise then I give you my blessing to retell this story however you want.