While headphones may be a great way to rock out to your favorite tunes all day, they also secretly want to kill you. How? Mostly when you’re walking down the street and not paying attention to oncoming traffic. Researchers gathered information of a 116 accidents involving cars and people wearing headphones. 70 percent of those accidents were fatal. They’ve also increased over the years from 16 accidents in 2004 to 47 in 2010.