Teacher: What do you want to be when you grow up, children?

A: Mommy said I could be anything, so I want to be a billionaire!

B: I want to be a doctor.

C: I want to be an average Joe.

Note: Joe is the short form and nickname for the given name Joseph. Perhaps Joe and Jane were once popular names. An average Joe refers to “an average, unexceptional, or ordinary person.” People also say “plain Jane,” referring to a plain woman, “Jane Doe” (a woman whose real name is not known or cannot be revealed) and “Joe Blow” (an average or ordinary man).