A tiler friend of mine did a conservatory for a customer, once the job was complete the customer refused to pay because they didn't like the tiles now they were down and said they were going to change them. My friend went out to his van and came back with his hammer and said he would save the next tiler the trouble of taking them up by breaking them now. The customer couldn't pay him quick enough, it was just an excuse to try and get out of paying.