While on a vacation to Earth, Pinkie Pie and Twilight Sparkle decided on taking a Human with them home to Equestria.
Twilight Sparkle had taken the precaution, and brought a few useful books with her. Certain the literature should help her out, if and when she was to need it.
Of course, how does one take the Human over the border? Having only the two saddle bags in which to carry everything they intend to take with them, the space is in premium, just to add salt to the bare flesh.