Well, we're all a little hostile every now and then, some of us are able to sublimate, others of us can't adjust. You know how it is.
We have this myth that extroverts are better salespeople. As a result, extroverts are more likely to enter sales; extroverts are more likely to get promoted in sales jobs. But if you look at the correlation between extroversion and actual sales performance - that is, how many times the cash register actually rings - the correlation's almost zero.