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In the old days, kegs used to have bungholes where they were filled, and a bung was fitted to seal it. After the kegs were cleaned, there was a person on the filling line that would inspect the kegs for cleanliness before filling, and would in fact use olfactory clues as an aid. Of course, the job title was "Bunghole sniffer". (True story, really!). And, no, that particular job did not prepare one for a career in management. Managers prefer folks with actual brown-nosing experience to those with just with the simulated sort.