Who calls a computer a CPU?

I sell computers and people refer to them as hard drives or cpus all the time. Its really annoying because they'll ask about buying the "hard drive" or "cpu", so ill start showing them hard drives, then they get confused and think im really stupid, before i realize what they are actually talking about out.

Yeah, the worst is when they think they are right and we are just abunch of ignorent dumbasses. :mad:

If you know computer so well, fix it your self!