Franklin D. Roosevelt once said, "There is nothing to fear but fear itself." He obviously wasn't an NFL fan, as we are always fretting over players on our favorite team's roster.
Sometimes that concern sprouts from a player seemingly lacking the maturity to handle life as a professional athlete. Other times, it's because the player hasn't been able to stay healthy.
And then there are those who just might not be good enough. Those players scare us (and head coaches and general managers) more than anyone else.
So click through to discover which player on each NFL team is keeping us up at night.