"If you want to be extremly nasty get a frequency generator. Plug it into a hi power amp and start dialing frequencies. There are some that will make people sick, give them headaches, affect the stomach and bowels.
I have done this. One frequency that will cut through any noise and cannot be filtered is 3500Hz."

Sounds like you are someone who would know this - Is there really a "brown noise", you know, a frequency that makes one sh** one's pants? Just curious.