"Can't control" being the operative note there, we agree. That said, there are a great many techniques and strategies to employ when negotiating in business. Using anger can be effective in some circumstances. But it is tricky and should be a calculated and intended use as opposed to "out of control". Those who use it constantly are typically not that good at negotiating and are far less successful. Those of us that have been around a while are not easily intimidated and will use that hyper state of aggression and emotion against you. ;o)
The best example is Jesus Christ driving the money changers from the temple. It is, I believe, the only example of him showing anger in the New Testament.