From a teacher as well. I worked third shifts during college, and one of my shifts fell the night before my 9:00 AM C++ class. The class was on friday, and I worked from 7:00PM to 7:00 AM. I would get an hour of sleep and then head into class. I missed several friday morning classes.
The day after my third and final abcense before getting booted from the class, as I was walking in, the teacher said to me with a full class
"Josh, I think you are an OK person, but I would never ever give you a good reference for a job".
Talk about knocking the wind out of your sails

. If I hadn't been so shocked I probably would have replied some sarcastic, smart ass thing and made her look like a complete and utter fool. But, I was so taken back, I was left speachless.