No one could make me work if I weren't being paid.
I had one bad experience in life. I was a grad student when I typed a doctoral thesis for a fellow student/TA from the sciences. This was pre-computers so you know it was hard work. The fucker 'paid' me two days before he migrated - he gave me a check which bounced. I was pissed but I laughed it off. I kept the check waiting for the right moment in time. Thirty five years later someone told me he had a massive stroke and was recovering at home. Someone else gave me his address. I sent him a get well card with the check with three words - thinking of you.