So I currently work at my first job and have for 2 years now. First project I had was to redesign a user info set up page. Didn't know any of the languages so kinda had to just wing it. Anyway finally committed my code and tested on dev server. Then code pushed to production and tested there. Then I saw a message from one of the top devs saying nobody could login. I replied saying that I was able to. Well, I actually ended up making it to where no one could log in except me. I learned real quick to never fuck up like that again. Surprised I wasn't fired on the spot.