That emotional rollercoaster when you refactor a huge mess and finally there are no more compile errors in it. But there are still endless broken tests to fix :(

If you have to review the code of other devs and they make the same mistake every f*cking time. But you are a friendly colleague so you try to keep calm and and remember them politely.
And so the only place to rant (and use the word "f*ck") is an app :(