I don't remember which one, but one of the plethora of "teach yourself to code!" guides floating around the web has all of their code snippets as images, so eve

I don't remember which one, but one of the plethora of "teach yourself to code!" guides floating around the web has all of their code snippets as images, so every time you used one of their example programs, you had to type it in by hand. It was horribly annoying (so I stopped,) but it was a deliberate choice to try and force understanding.