My friend in Kansas City told me about a home owner/contractor by his parent's house out in the country that hired a drywaller to do some work on his house.
Well when all was said and done, the owner paid the drywaller and the drywaller said- You still owe me $1100- The owner must have told him to f-off or something and turned and walked away. The drywaller pulled a gun and shot him a couple times in the back and killed him.
That is why I never try to piss people off in person...only on anonymous forums!