Heard from an IBM field service manager:
A huge travel agency in Florida (a major booker of Caribbean cruises for blue-haired retired ladies) recently bought an IBM 3090 to handle the reservation database. When the deal was consummated, the proud new owner asked IBM to install it in a big glass room right behind the receptionist's area so all the customers could see the flashing lights and spinning tape reels as they walked in — a testimony to the modernity of the agency.
Good idea, except there are no blinking lights on a 3090. So the service manager offered to build some. They hired a theatrical designer to come up with a suitably futuristic "set", got curved glass walls to minimize reflections, and installed the mainframe behind the "real-looking" facade. The customer declared that it was exactly what he had in mind, regardless of what the actual computer looks like.
Moral: the customer is always right.