I think my son's professor could use this advice. I had this on the outside of my binder for one of my classes when I went back to school for teaching. (Which I ended up not pursuing after the second year.)
Well, at least yesterday helped. He think he might have done very well on this lab. I had to wait 3 extra hours to get him while we were having a snowstorm. (That was the majority of my really bad mood.) Made it there and back in one piece. Good times. Not. It was also the time of the evening commute so lots of traffic.