Sam noticed that her cubicle mate was increasingly exhibiting angry and aggressive behavior. Every time something went wrong at work he would get​ upset, throw his hands up in the​ air, and start swearing under his breath. Several times he banged his desk so loudly that those around stood up to see what all the commotion was about. One day he even walked right up to Sam and while an inch away from her​ face, started screaming at her. This is an example of​ __________________.