Teachers evaluate their students all year long. But a few times a year, the tables are turned. This is student course evaluation time.

It’s when students evaluate their teachers and their courses. These evaluations are anonymous. So you could imagine how brutal some of them are.

Brutal and hilarious. Some teachers have a good sense of humor about it. So much so, that they’ve decided to share some of their evaluations on Twitter.

Here are 30 seriously brutal and hilarious evaluations students made about their professors: