Because this has ZERO FAILURE MODES

In a vague attempt to get my brain to focus on ANYTHING BUT THE crackfic epic, havocthecat has convinced me to throw caution to the wind:

Inspired by Doctor Who's "Turn Left:" Pick one of my stories and tell me a point in the tale that you'd change -- something tiny or big -- and I'll tell you how that one difference would have altered the course of the entire story.

Fic can be found under the fic tag here.