As far as acoustic bass, low frequencies, LFE etc. The BEST experience is actually HEARING sub 20Hz material. In a car or near a bass bin you FEEL the shaking of what you're sitting or standing on. This is why I don't like ass shakers. They may be alright for apartment dwellers but things putting out low frequency energy don't shake your ass only!
It's definitely possible to HEAR the lowest registers of some of the bigger pipe organs. 16Hz is no sweat on a 32' foot register. 64' (8Hz) and 128' (4Hz) are amazing too. The problem with these low frequencies is your ears aren't very sensitive to them and the levels have to be so loud for you to start hearing them causes things around you to move - sometimes quite violently. (earthquake!)
They say there is no such thing as a brown note. I guess that depends on how you define that. I don't believe a sound exists that makes a person lose control of their bowels and defecate explosively. (good thing!) However exposure to certain LOUD things at lower registers can induce nausea, difficulty in breathing and sexual arousement!