I used to write all my university essays on an old pounder. As I was too lazy to write a rough copy, every one of them was perforce a final draft. Direct to disk, we called it. And as I could not be bothered to correct any mistakes in the typing -- typing "k" to start a word, for example, rather than "l" -- I would instead have to think of another word that did start with k. Sometimes the essay would veer off in a completely different direction by this serendipitous process.