These five crazy, futuristic, and veritably frightening weapons may sound like they come from epic sci-fi flicks, but ... they actually exist. 1. Speech-suppressing gun. This gun was designed by Japanese researchers to silence people by messing with their heads. It could ... be used to silence protesters [and] important political figures. Talk about an Orwellian nightmare come true! 2. Vomit ray. This weapon ... uses radio frequency (RF) to affect a person's sense of hearing and equilibrium. Anyone hit by these waves (which, by the way, can pass through walls) is expected to throw up. 3. Pain ray. More formally known as the Active Denial System (ADS), the pain ray is a weapon developed by the U.S. military that can ... cause excruciating pain by emitting high-powered waves similar to those from a microwave oven. A smaller version of the pain ray called Silent Guardian was developed by defense technology company Raytheon and is currently available for use by law enforcement agencies. 4. Mind-control gun. Russian Prime Minister Vladimir Putin recently admitted that the country's government created a gun that can put people in a zombie-like state. Studies about the effects of electromagnetic radiation on the brain reveal that one of its possible effects is implanting thoughts and suggestions into a target's mind. 5. Self-guided bullet. The U.S. [has] developed a new kind of bullet that could turn anyone into a sharpshooter. As long as you shine a laser beam to what you want to hit, the sensor on the bullet's nose can follow it ... even if the target is up to a mile away. Most of the weapons in this list may not be created to inflict fatal wounds, but they sure have terrifying implications.