Sport Science, a show on FOX Sports that delves into the scientific mysteries of sports, unlocks a real brain twister in this video. For generations, the greatest human minds have wondered, "Will a man's heart rate go up if he thinks he's going to get hit in the testicles?" In order to navigate this labyrinthine scientific problem, they fired a tennis ball at 50 mph into a guy's balls, scientifically proving that guys getting hit in the balls is absolutely hilarious.