Wonder if this ever comes into play in real life? Via Science Blog:
Wielding a gun increases a person’s bias to see guns in the hands of others, new research from the University of Notre Dame shows. In five experiments, subjects were shown multiple images of people and determined whether the person was holding a gun or a neutral object such as a soda can or cell phone. Subjects did this while holding either a toy gun or a neutral object, such as a foam ball.
Simply showing observers a nearby gun did not influence their behavior; holding and using the gun was important. By virtue of affording the subject the opportunity to use a gun, he or she was more likely to classify objects in a scene as a gun and, as a result, to engage in threat-induced behavior, such as raising a firearm to shoot.
“Now we know that a person’s ability to act in certain ways can bias their recognition of objects as well, and in dramatic ways. It seems that people have a hard time separating their thoughts about what they perceive and their thoughts about how they can or should act.”