Most of my students know that I hate grading papers. To force myself to do it in a timely fashion, I promise them that I will have their tests graded by the following Monday or they all make an A. So far, I haven't had to do that---but I've ruined some Sunday nights. However, occasionally grading has its interesting points. Take a look at the female student's drawing below. By the point in the semester when this test was given, I knew her well enough to know she wasn't trying to tweak me.