That SciShow tackles the familiar, if at times grating, experience of getting a song stuck in your head. It's called an earworm—that repeating snippet of music, probably fifteen to twenty seconds long, that plays in your head without you consciously doing anything. But why does it happen? And what can we do to get rid of them? Michael Aranda explains current scientific thought on the subject (and also does a pretty good Shia LaBeouf impression).