Sometimes a particular How To will come into my mind as a reflection of what kind of day I have had. For example, if you visit this site and see How to Smile at Everyone, you can assume I have had a good day. If you see How to Fall Down While Inexplicably Wearing a Tube Top, you can probably assume I was drinking at lunch. So today you get How to Change the Litter Pan because it was a bad day, one that was partially full of crap. And also because it was easier to draw than How to Serial Kill.