In the past 7+ years, over 250 people around the world have died while taking a selfie. In fact, 127 of those deaths occurred between March 2014 and September 2016 alone.
In trying to get the perfect pose to Tweet or put on Instagram, people have misstepped (or ran out of land) and fell into water, off a cliff, you name it. So a handful of countries are trying to combat the problem.