Confession: a very important feature of the website I'm developping wasn't working for a certain time. The boss wasn't aware because he doesn't go on the site, and I only found out last week because I needed to implement a new feature that used the previous one. Problem: the bug was only on production, not on local (and of course we don't have test server).
I took advantage of the absence of my boss today to clear the situation by making all of my tests on prod. I hope no customer tried to pass a command today, but it's finally repaired. I am both proud and shameful.