Scene from "Survivor Shy", a story that follows Fluttershy living in a world completely and suddenly devoid of other ponies.
With nopony to turn to, Fluttershy is forced to learn to fend for herself, and find a way, if possible, to bring back ponykind and save Equestria.
I had this scene planned before "Just for Sidekicks" aired, and was originally going to include Pee Wee in the story, being looked after by Philomena. The aforementioned episode changed that, and will probably be the last episode to affect Survivor Shy, since I now consider the fic to be in an alt universe that branches off before the Season 3 finale.