A pair of activist groups have taken a tactic straight from the Oscar front-runner "Three Billboards Outside Ebbing, Missouri."The movie centers on a grieving mother, angry that the man who raped and killed her daughter still hasn't been found and brought to justice after several months. In an effort to keep her daughter's death from disappearing from everyone's minds, she rents three billboards just outside of town, paints them bright red and writes a message in bold, black capital letters across all three: "Raped while dying," "And still no arrests?" "How come, Chief Willoughby?"In the film, they're a visually striking form of protest, and in the past week, they have inspired at least two real-life responses to tragedies in Florida and England.