This literally happened in my current team, and I'm not even an experienced dev yet.
Incident happened like this :
Our team is working on a RCP based on eclipse plugins, which has a headless mode and a GUI mode. Now, in the GUI mode, my manager cum architect thought there are no need of user log files (long story) because the user can see the info on screen, whereas in the headless mode, she wanted me to print the logs onto the console and a log file as well.
Now it just so happened that our team had got a recent addition as a replacement to our lead developer (she left the company) who claimed she had 3 years of expertise and a masters degree, and she was assigned a task. The task was to format a custom file we were generating out of the product (basically dumping info in a file) in a human-readable format. Miss new-addition-masters-degree decided it would be a very good idea to redirect the standard java output stream to a file output stream ( which she used for generating the formatted file ) but somehow never realized that she needed to reset the output stream back to standard output.
Consequences were devastating. I wrote the logic for the logger ( yes, apparently any available logging mechanism won't do it, again, long story ) and had it printing to a file in tmp directory. The logs seemed to be working fine initially but after a few logs, specifically from the point where the formatter started working, all the logs got printed in the formatted file. And this file was supposed to be used by our clients to develop something on top of it. Naturally, I got the heat of it and then naturally, worried and nervous and curious and in a frenzied state of mind, I started debugging.
When I got to the actual fault, I seriously could not decide whether to cry or laugh or call up miss masters and scream at her. I decided to ask her about what the hell she had written and her answer was most of it was written by the developer she replaced, so she didn't know it would cause this much problem. Anyway, I fixed the leak after that and averted the catastrophe.
And that, fellow devs, is the story of how I solved a crisis in my first year at corporate.

Today i faced a "bug" which caused an element not to trigger a Bootstrap 3 accordion by klicking on it. Only on iOS/iPhone - Desktop and Android worked fine.
The actual problem was that almost the same structure worked fine on another website...
took me about 3 hours to figure out that the element which was supposed to trigger the accordion needs the css property 'cursor: pointer;'.
why the hell does a touch device, which got no coursor, need this property?!

The most annoying thing about the pain I suppress is the dumb creatures around me that are vaguely human in appearance who all went crazy years ago who still at points early in this pop up and mock me for it as if disbelieving. I am strong and I remain strong so I don't always show how much half a life of watching people consistently recycle then further trash the world effects me. In time a person quiets their complaints so as not to be dourly effected by intense psychological disturbance. In short they grow numb. These creatures poured all their brain cells out a long time ago trying to be impish or monster like and instead become progressively more pathetic and worn thin. And I don't know whether to laugh or cry at the fact that even though I repeat things they seem to have fucked themselves into it trying to be the cruel meanspirited trash the victimizers they emulate made them. It's like Pavlov rang the bell himself.