One time, we picked up a Xamarin project and both Android and iOS teams had to pick a developer to handle it. After talking over it with my iOS bro, I decided that I hate C# far too much to start a project on this, even though I wanted a new experience, so iOS bro took over it. I got handed another iOS project in the meantime. iOS bro decides to take a free week from work after like a month or so of working on that project.

GUESS WHO DECIDED TO COME OVER AND WORK WITH US THAT WEEK? THE OWNERS OF THE PROJECT (they were handling the API). Guess who had to drop all projects at once and work for a whole week on a project he had no idea about in a programming language he only had a remote idea about? THIS GUY.

So, aside from the fact that I had no idea what I was doing, I also had the pressure of the owners working right next to me (they were cool people, but it's still a stress). That week really raised my stress level through the roof, as I doubted myself everyday that I would be able to be productive on that project. I got myself a free week too after that.

But yeah, this experience really made me doubt my skills as a programmer, as Xamarin was supposed to be just a cross-platform way of developing an app.

All in all, I've never had to work on that project again... but it was still an "I can't fucking believe it" moment when, one month-ish later, the project was to be scrapped and reprogrammed on ye olde Swift.