We've all been there, sitting at the lights when the car in front waits a beat too long to get underway. No biggie, we give them as much of a courteous toot of the horn as possible. And undoubtedly, most of us have been on the other end of it.

Problem is, there's a very fine line between a "Hey, look, no rush, but would you mind, um, getting underway soon" kind of honk, and a "What the f*&k are you even doing in there?!?! I'm LAAAATE" sort of honk.

Well, fear not. YouTuber Mark Rober has come up with a solution, and it's pretty good. A mod for the ages we reckon.

Image credit: Chris Moyer