nothing new ever works

I'm having a new bathroom put in at the moment. The plumber was here doing some plumbing. Then the tiler was doing some tiling. He proudly mentioned that he had a new van. When he said that I thought of the New Law from Jerry Weinberg's The Secrets of Consulting

Nothing new ever works

Then he says he has to go out to get something. He says he'll only be half an hour. Ninety minutes later he's still not back. For a moment I start to think negative thoughts about the stereotype of an unreliable workman. Then I remember his new van. Sure enough, he turns up a few minutes later and he's fallen foul of the New Law. His new van had got a puncture, and being the first one it had taken him ages to change the wheel.