I had a older female patient get mad about her bill for her husband. She accused me of lying about the total balance due and that I was wrong. I tried to explain the insurance to her but she was confused. She walked out after paying only a portion. She later sent a letter apologizing and explaining that she had found out recently that she was ill, and was worried about her finances She did pay her remaining balance. I kept my cool and I was honestly shocked by her anger. She ended up passing away sadly, within a year.