I have trouble with documentation. Paperwork, especially, but also: I can never cite a reference in real time. I know stuff, but I forget where I heard it. Dumb stuff, too—stuff nobody needs to know, like I was once asked what country had the lowest birth-rate, and I knew it was Ireland, and that was true (at the time), but they also asked where I heard that, and I couldn't say. I remember now, where I heard it, but it doesn't matter anymore. The point is, documentation matters to some people, so you have to provide it, just in case somebody wants to refer to it later.
