I didn't draw a background because I'm lazy.
After the Doctor left his TARDIS and got acquainted with hands again, he looked around and realized he was at a school. All the teenagers coming and going, not paying much attention to anything outside of their conversations and cell phones.
The Doctor decided to move the TARDIS anyway, just in case, but quickly thought against it as the box did block the path of anyone wanting to go to Equestria.
As he went towards the doors of the school, fully intending to pass himself off as a teacher or caretaker, or maybe a student if the people were stupid enough. He made it just to the threshold when he bumped into a teenager. He backed up to see who he had freed from the grasp of technology, but to his surprise it was none other than Twilight Sparkle herself. He would have said something to her, but the look in the girl's eye told him that this was not the same individual he knew. That look, by the way, was almost one of indigence. As though she was a bit more well-to-do than the princess was. "Sorry." was all she said, very off-handedly too, as she walked into the building with a very heavy-looking backpack.
The Doctor quickly scanned the backpack with his sonic screwdriver, and cocked his very angry eyebrows at what the girl had; an energy scanner. "Now wha' would ya bring tha' fur." He whispered in his Scottish brogue before following the teen inside, and through the sea of raging hormones. Keeping the sonic tuned to the signal of the scanner he managed to navigate the traffic, and bumped into the girl again, this time with the scanner out. "Who are you, and what is that?" The purple young lady asked, rather nastily. "I could ask you tha saeme thing." The Doctor replied in a low tone. The bell rang, and all the students began scrambling to their respective classrooms leaving the odd pair in the middle of the hallway face to face.