I once worked with a guy who was always moaning and groaning about his "bad back" as he worked. He was doing the job "under the table" because he was receiving "Workman Compensation" pay from the government for an industrial accident, and if the government knew he was working he would lose that. I ran across a really good masseuse/physio therapist who was visiting from Japan. I told my work mate that I could get him a session and I was very confident that it would fix his bad back. He looked at me with trepidation and said: "Oh, no. I will lose my Workman's Compensation!" He wouldn't book an appointment with the therapist.