What is the worst sound in the world? This is a subjective question, of course. For some, it could be the sound of a baby wailing. For others, it could be the sound of a steamroller. For still others, it could be a One Direction song.
In this video by BuzzFeed, a group of people are asked to listen to what a study by researchers at Newcastle University, UK, determined as the worst sound in the world.
How did they react? And how will you react when you hear it?
Watch the video above to find out.