_The Art of Electronics_. As a software guy who sometimes is involved in embedded systems, having a good understanding of what's going on at the resistor/capacitor/transistor level would have helped a lot. I did a bunch of hobby electronics as a teenager, but never had circuit theory. I knew a lot about digital design, but not the analog stuff that the whole world ultimately rests on.

So now, when I hear a switching power supply whine in protest, I will think of it as the squeals of pain of the engineers whose life I turned into a living hell because of my lack of appreciation for P = IV. I’m truly sorry. I wasn’t thinking. (And this is just the first chapter of that book).