One night, after one very stressful week of production code fixes (I was working on a game with some friends and I created the network infrastructure for P2P and database communication from scratch), I was at my gf's house. After we fell asleep, I stood up and screamed right at her something like "I fucking already told you how X works and how to communicate with Y. Learn to write code properly and after double checking yours then you shall ask me for a non-existing 'bug' fix. Learn how to properly write event based code and use polling you moron!". After that I turned to the other side and fell asleep immediately.
When I saw her the next morning sleeping in the couch, I could not understand why... Only after she described to me the whole incident I started laughing.
After that I just took two weeks off the project and after that period I never actually worked the same way (so hard) in my free time with them.