Yes, the CIA had a real-life "heart attack gun" about 42-years-ago, and we can only imagine the tools they possess now. This secretive weapon was used for assassination missions, and shoots a small poison dart that can penetrate clothing. It leaves nothing but a tiny red dot on the skin, and causes a lethal heart attack. The target may feel as if they were bitten by a mosquito, or maybe nothing at all, as the poisonous dart completely disintegrates upon entering the target's bloodstream. Click here to view the first image in today's viral picture gallery. Continue reading for the five most popular viral videos today, including one showing what would happen if video games were 10% more realistic.