Remember, the 'customer' is always right. [=never argue with a customer]
He is one tough/tricky 'customer'. [=he is a tough/tricky person]
The company has good/poor 'customer' service.
(..) - So, what's the climax of our show? - Show? - You don't have a show. - We have a week's engagement. To perform magic, not butcher birds and break my customers' fingers. Clear out, anything here in the morning gets burned. - Mr. Merrit... - It's done, John. I've hired a comedian. (..)2006 The Prestige