Dr. OldNBald IS a teacher.

Dr. OldNBald is a horrible teacher. When he teaches us new stuff he always uses variables and never does examples for us with real numbers.  That’s why we did so bad in his class, and when we asked him to do examples with numbers, he refuses. You might as well sleep in the class, and you’d get the same amount of useful information.  And he makes his tests hard on purpose, and most fail. The only ones that didn’t were ones with tutors.