I was grading for the Data Communications course (it's just networks), and the professor leaves me the first quiz to grade, along with the solutions.

Half the solutions are wrong, and no problems are assigned point values. I asked him how I should grade it, even how many points total it was worth.

"You decide."

Nearly every student got a perfect score on every assignment from me because it was clear the prof. didn't care, and I wasn't about to make my own answer keys for often incomprehensible problems and incomplete solutions.