Part 1 of 2. Within the world of basketball, Gary Payton and Draymond Green both possess the abilities to "get in the head" of opposing players, and have used their trash talking skills to achieve personal and team success.
Part 2 of 2. The world of sports is perhaps the only place in society where there is an unwritten and unabashed acceptance associated with a culture of psychological warfare. Many whom engage in this psychological warfare deploy verbal and non-verbal weaponry that effectively alter the mind state, and ultimately the playing ability of their opponents.