After thirty years as a sewer worker, Jim's record was acknowledged by a visit from the town's mayor who wanted to see for himself the valuable service that Jim performed. So the mayor climbed down into the sewer and asked Jim why he liked his job so much. "Well," said Jim, "my job is fascinating. You see that big poop floating past us now? That's from the carpenter. I can tell because you can see sawdust in it. Now this next poop, that's from the gardener. I can tell because it's got grass clip…