answer:Those who have to suck the waste out of the Port-o-johns(janes). I was tutoring a student over the summer. We were at a park, sitting at a picnic table and a port-o-john was not all that far away. When the worker came in his big truck, pulled out the long, fat, white tube and starting sucking the crap out, well, the smell was enough to knock you over. We were about a good 30 feet away and we could smell it. Dirty job.