Some people

Did you ever know some one who took it upon themself to make the people around them miserable? I know this person who seems to thrive on pissing people of and I just don't get it. Is it a power thing? If they make some one mad does it some how makes them feel more important? Personally I think carma will take care of this person and teach them it's much better to make people happy than to ruin their day.