I also found a funny joke
A plumber is replacing all the old water pipes in a house. He solders all the valves and large fittings, but does not solder any of the small elbows and caps. After he says that he's finished the job, his boss turns on the water supply. Water shoots out everywhere, making a huge mess. His boss discovers that the plumber didn't solder half of the fittings. When his boss questions him about that, he says "They always say, don't sweat the small stuff!"
Re: Innocent plumber