Final answer:
In 'Mean Girls,' a character's act of calling another character's mother under false pretenses to get her out of the way is an example of Instrumental aggression, which is motivated by achieving a goal rather than a desire to cause pain.
Step-by-step explanation:
Instrumental aggression is a form of aggression motivated by achieving a specific goal without necessarily intending to cause pain. In the context of the movie, the character's goal is to remove a romantic rival to improve her chances with a potential romantic interest. This action is taken not out of hostility or emotional desire to harm, but as a means to an end. Unlike hostile aggression, which is driven by anger and the intention to cause pain, instrumental aggression is strategic and goal-oriented.
Examples of instrumental aggression can be relatively harmless, like playing a prank to win a game, but can also be severe, such as the actions of a contract killer. In both cases, the primary motivation is to achieve a desired outcome, which distinguishes it from other forms of aggression that might be driven by emotional impulses.