When you are stopped at a red light and you shine your brights at a car stopped at a red light across the street. Once you shine their car multiple times it will result in them shining back. Thus, causing a bright war.
(Two people in car at red light)
-Yo! shine your brights at the car across the street
-Ahhh There shining back!
Fuck! this is awesome
-THE BRIGHT WAR HAS JUST BEGUN!