I was in the doctor's waiting room and a young woman was making one loud long call after another even though there is a sign posted asking that cell phones be turned off because they interfere with the medical instruments. I finally asked her to get off the telephone or leave. I got a rude answer, so I raised my voice and said "Your f*cking life is not interesting! Shut the f*ck up!" She complained on the telephone that I was being rude and that she had to get off the telephone because of me.