Fic rec: Life Is a Lemon · 3:59pm Nov 18th, 2012
http://www.fimfiction.net/story/47908/Life-is-a-Lemon
The premise is simple: pony thinks she's a lemon. Add in Blueshift and you have wacky hijinks. This is pure Blueshift madness, honestly veering towards fridge horror and sad more than comedy. But you can't find concepts like this anywhere else.
I was privileged to help edit an early version of this story, so I know how good it is. :3 Go read it!