Those projects that start easy, and then suffer from: hmm, let's try that, then let's try these add ons, etc. And everything works, for years, and then you need to return to them, but can't remember anything! And then, it turns out, that you don't have the time you used to have. And even though you loved tinkering late into the night, 10 years later, hight has become precious. For sleeping. Or trying to sleep!