Every month, Dr. Alvin patiently awaited the arrival of his regular patient, a young man who always arrived right on time. But today, the young man was late, due to bad traffic. The patient nervously walked toward Dr. Alvin's desk, sitting down beside him.

"You are late." Dr. Alvin said, before leaned closer and set his stethoscope on the young man's chest.

"Take a few deep breaths for me..." He slowly focused on the young man's heartbeat before adjusting his glasses.