10. Refusing To Cover Relevant Material
Few feelings are worse than sitting down with a test that you thought you studied for, only to find out that none of the material on the test was actually covered in class. Sitting through lecture after lecture and still not being able to have a firm grasp on the course work is a frustrating feeling.

11. Odd Clothes And Hair
You’re supposed to be able to take your professor seriously. So when they show up with weird hair choices and clothes from the 1940s, it can be challenging to hear what they have to say. That handlebar mustache or that plaid skirt from the one room schoolhouse era might be charming in the teacher’s lounge, but is distracting in class.