I have three points.

One, there is no cause for cupcakes here. *shudder*

Two, seeing as how we're doing this fanfic thing...
Equestria Daily: Story: Fallout: Equestria (Updated 100% Complete!!)
It's long as hell, and arguably as gory as cupcakes at times, but it's definitely earned it's legendary status among bronies.

Three, you cannot mention robot ponies without forcing me to link this...
Robot Ponies - YouTube