What Are The Most Annoying Things People Do Whilst Gaming?

I'm not gonna lie to you, some people are downright annoying when it comes to gaming and the things they decide to suddenly do are enough to drive one crazy. I regularly play FIFA with friends when they come over or when we're at someone's house and there are some things that just tick me off despite the largely passive person I am. I'm also guilty of some of these bad habits so I'm definitely not sitting on my high-horse of superiority. I also do some of these annoying things from time to time because I'm human and as far as I know, so are most of you.

Well, I didn't get anywhere near the rant I thought I'd go on for this topic but maybe you've got an axe to grind. So what exactly are the most annoying things that people you know do whilst gaming?