If you've ever been in a classroom for even five minutes, it becomes readily apparent all of the different types of people that you find in a class. The habits of your classmates become something you have to deal with for an entire semester or in some cases, a whole year. After talking about this topic with a couple of my friends, we compiled a list of the 12 worst types of classmates to ever exist.

1. The pen clicker.

Probably the most common, and possibly the most annoying, habit. Why is it necessary to click your pen that much when you could be quietly taking notes?

2. The drummer.

I love a good beat just as much as the next person but not when it is coming from the back of the room for an hour and a half.

3. The heavy breather.

While this doesn't bother me quite as much, it was one of the first things my friends mentioned and felt very passionately about. Fun fact: this is actually a literal phobia, called misophonia, which means "the hatred of sound".

4. That one person who just refuses to listen.

Professor: "Your paper is due Tuesday."

That one person: "Wait...when is the paper due?"

Every. Single. Time.

5. That one person who just can't properly cover up.

Crack kills, you know.

6. That one kid who always walks in late.

Please feel free to interrupt the lecture everyday by making an entrance twenty minutes after class started.

7. That one person who always says it is their last piece of gum when you can clearly see the full pack.

I personally don't chew gum, but this was another one of those things that got my friends up in arms.

8. That one person who randomly sits in your seat halfway through the semester.

It might not be assigned seating but that was my seat.

9. That one person who you've never seen in the class until the very last day.

I'm still convinced that these people just transfer in on the last day to throw us all off.

10. That one professor who just reads verbatim off the PowerPoint.

It isn't just the students who have annoying habits. Are you seriously putting me into thousands of dollars of debt to just read us the bulletin points?

11. That one person who still hasn't learned the concept of personal space.

There is literally not a single reason why you need to be touching me while asking what the homework was.

12. That one person who still hasn't learned the concept of hygiene.

For the love of God, please just put some deodorant on.