If there are so many types of people in the world, everyone being special and unique, why are so many customers the same? We clerks can be similar because we have training and policy. Customers will say and do the same things over and over, each one thinking they are the clever one to come up with it. A classic example is gift wrap, but there are more.
When I go shopping, I barely speak anymore because I fear that I am mindlessly repeating phrases that clerks hear all day.