Sonic weapons are not just a thing of science fiction stories, they actually have been, and to some extend still are being tested and used by military and police forces. Being particularly careful of my ears, I hope I will never have to experience such a thing. 

That said, a good dose of sub (while wearing ear plugs) can be quite pleasing, and that seems to be what E13 000625 by Alberto Tadiello can provide. This piece of sound art, inspired by the before mentioned sonic weapons, comes on when visitors approach it and hits them in the stomach, emitting low frequency sounds.