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Feces is offensive to all 5 senses
(sopuli.xyz)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Sound? I associate the sound with ppl; once it's out, it's pretty quiet.
I think association counts if the sounds associated with it are consistently repulsive. For example, the sound of flies swarming around a pile of crap.