you had one job 

Response to failing to do the one and only thing you had to do. This is told, either in a disgusted, mocking, or angry tone to people, animals, inanimate objects, and anything else that fails to complete the simple task for which it was designed.
A way to express total fail, epic fail, especially when the one job was very simple.

To a cheap park bench that broke while I was sitting on it, "You had one job, park bench!"
To an accountant who was fired for inaccurate computing of business records. "You are supposed to be an accountant, right? You had one job, Sandy."
To a friend about my broken down car, "Damnit, it had one job!"

you had one job by Wwerker October 13, 2014

you had one job 

What bad guys say to their henchman when they either fail their task or get distracted.

Chicken Run lady: You had one job, Mr. Tweedy!

you had one job by frabrizio July 18, 2018

You Had One Job 

A meme that is meant to draw attention to blunders made on the job.

Guy 1: Are those Doritos in the Fritos isle?
Guy 2: You had one job, store manager!

You Had One Job by egs1505 May 7, 2018