In December of 2015 during the 280th episode of their podcast, the McElroy brothers prepared to answer one fan’s question: “What is the best way to tell someone they’re driving the wrong way on a one-way street?”

After sharing various horror stories, they proposed an emoji system that would let drivers know when they were in the wrong. Fortunately, the emoji idea evolved into a definitive 3-car-horn system, including a distinct sound for each of the following: a danger horn (for regular traffic purposes), a sound horn (to be part of the “road conversation”), and a “great job” horn (to let people know when they do a kick-ass job at parallel parking and other such things).