[metmom]

I heard some time ago, that certain sound waves have the effect of making people need to relieve themselves. I understood that it was very effective in campus riots. This was a long time ago and I cannot recall where I heard that.

It would be pretty effective, even though messy. It’s awfully hard to resist nature when it calls.

[Drawsing]

I heard some time ago, that certain sound waves have the effect of making people need to relieve themselves.

I believe this is a myth that was busted on MythBusters. One of the guys stood in a room wearing a diaper and was blasted by super-low frequency sound. Nothing happened.

[RhoTheta]

The other thread had a reference to playing the "brown note" so I looked it up on Wikipedia. Sounds like some serious research work, including Myth Busters, had a go at it, but none of the experiments, involving sub-sonics at high dB levels, ever seemed to do more than cause a vague feeling of dread.

Robert Heinlein even mentioned this concept in Sixth Column.