Don't be fooled by the title, 'the world's dumbest app' is actually quite brilliant - literally and figuratively. The marketing people behind this are kind of geniuses because, face it, we all wave out phone in the air when trying to signal someone.

Sometimes it works, sometimes it doesn't. However, add that to a bright, flashing, specific color, and we can find you in that one thousand plus crowd of people.

You might want to turn down the volume though if you're at work, there's lots of bleeped language in the video.