The Sunk Cost Fallacy

The main effect is just if I'm going to make a substantial change, like three whole lines of code at once, I really want to find some way to change two of those lines first and then one line after that. And the surprising thing is it feels so good solving that puzzle. There's a greater expense to every step that you take, but there's a lower probability that you'll do a bunch of work and have to throw it away.