Air escaping through every exit
Even though our bodies are ours, we have less control over them than we think. Trying to control your bodily functions is a near-impossible task that takes decades of Monk-like training. And even then, everything can go wrong at the same time.
This person’s coworker had a pretty bad stomach ache one day. He had to cut the cheese but didn’t want to offend his coworkers’ ears (he didn’t think of their sense of smell). So, to “mask” the fart, he pretended to sneeze, which only amplified the sound of his toots. Lots of laughter and “ews” followed soon after.