Basically, my quota system occasionally makes me grab nonfiction books on impulse, because I occasionally I will realise I currently have no nonfiction in my to-read pile, panic, and go to the library to get the first thing that looks interesting. Which has worked out well for me! It led me to read the awesome magician's history book and the hilarious 1850's dangers-of-New-York-City book. But it's still a thing I'm not very used to doing.