Pete the sewer worker has been in his job for twenty years and the town mayor decides to visit Pete at work and make a little presentation. The mayor climbs down into the sewer and gets chatting to Pete about why he likes his job so much. "Well" Pete says "My job is fascinating. You see that big turd floating past us now? That's from the carpenters. I can tell because you can see sawdust in it. Now this next one. That's from the gardeners. I can tell because it's got grass clipping s it. Now the big black turd coming into view now is from my wife". The mayor is incredulous. "Pete, I can understand the logic behind the gardener and the carpenter, but how the hell do you know thatthat turd out of all the millions of turds in the sewer is from your wife?" "Ahh, it's got me lunch tied to it."