Feces is offensive to all 5 senses
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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.
Which reminds me:
Two flies sitting on piece of poo. One of them farts, says the other,
'Do you mind! I'm eating!'