Negative emotion eh? That's what video games are for me, to get ride of everything I've built up through the day.
If I'm playing sport games like FIFA I'll yell at the referees cursing them for making stupid decisions (surprisingly I'm calmer watching real sports and real refereeing mistakes). If I'm playing CoD I'll curse the developers for making such a buggy game, curse the campers, curse the internet, etc.
I'm generally calm in person and don't get angry easily, but I save that for video games. Oh and my mic is never on unless I'm playing with friends in which case it's party only chat so I don't annoy people who just want to play and not have people go nuts. :P