Yes, Invocon Inc., funded by a Navy contract is developing a weapon that can shoot invisible beams through walls and cause people to get dizzy and fall over. The beam can also cause motion-sickness that can induce vomiting. The gun shoots RF energy that excites and interrupts a human's hearing and equilibrium. This gun isn't really being developed as a way to harm individuals, but just to incapacitate people and embarrasses them if they vomit easily from motion sickness. Call me a little twisted, but this could be mighty fun in a public place.
Navy Researching Vomit Beam [Danger Room]