I had a roommate once whose brother was in a classroom attending the LA police academy when a cute young female tech brought in something experimental in crowd control technology. It was a big ominous looking black box on a cart.
She plugged it into a wall socket, turned it on and smiled sweetly as every man in the room grabbed his crotch and hobbled quickly out the door. The sucker put out some sort of low frequency sound which relaxed the adult male bladder.
But it only worked in enclosed rooms.
You can make a system like that work from a distance if you have several speakers. You adjust the phase and amplitude going to each speaker to create an interference pattern. Done correctly, you can have a steerable beam that you can direct at specific targets. (This is how phased array radar works.)