When I attend the pre-construction meetings I'm pretty damn sure the contractor gets the point that he doesn't want to F with me.
I've been doing this too long, seen plenty, and it seems the older I get the less patient I am.
The latest and greatest........Long story short, I asked a foreman not to place concrete because his forms weren't right. This foreman and I had a great relationship. He called me later and told me that his superintendent told him to pour it anyways. I went back to the site, tore the forms out and tossed them into the back of my truck. True story.