I believe the term you ' re looking for is nonlethal terminal velocity . It ' s my favorite oxymoron ! <| sep |> Thanks ! I shall try to reduce contrast . <| sep |> Rolling coal is a form of conspicuous air pollution , for entertainment or for protest . Some drivers intentionally trigger coal rolling in the presence of hybrid vehicles when it is nicknamed Prius repellent to taunt their drivers , who are perceived as being environmentally motivated in their vehicle choice . Coal rolling may also be triggered at foreign cars , bicyclists and pedestrians . Users cite American freedom and a stand against rampant environmentalism as reasons for coal rolling . I ' m not even American , but I love you guys so much . 3 <| sep |> who hurt u