An event or moment when you were less than perfect one page essays

The moment of my life when I was about to graduate in college and I had this one subject where the grade I got prevented me from being a cцm laude graduate. I was lax with that subject, thinking that I will be able to attain a high grade even with minimal effort, and that was where I was wrong, and it cost me something which I cannot bring back.

Imperfect Translation.

Explanation:

One event where I wasn't perfect was this opportunity job I had. I'm a English/Spanish translator, but never had this kind of job, which was a live translation for a patissier chef, who had a Hungarian accent.

Don't get me wrong, I didn't fail in the job, but there was some events where I didn't translate perfectly.