My brother is an ophthalmologist in a small town in India. In his private practice, patients have two options to see him: either take an appointment or walk in. Most patients don't take an appointment due to a variety of cultural and logistics reasons and prefer to walk in. These patients invariably have to wait anywhere from 15 minutes to an hour and half on a busy day. I always found these patients to be anxious and unhappy that they had to wait, even if they voluntarily chose to do so. When I asked my brother about a possible negative impact due to unhappiness of his patients (customers) he told me what matters is not whether they are unhappy while they wait but whether they are happy or not when they leave. Once these patients get their turns to see my brother for a consultation, which lasts for a very short period of time compared to how much they waited, my brother will have his full attention to them and he will make sure they are happy when they leave. This erases the unple