Me: Hi Joseph!  What are you doing?

Joseph:  Doing.

Me: I see that you’re doing something, but what are you doing?

Joseph: (very matter-of-factly)  Doing.

Me: Yes, but what are you doing?

Joseph: (getting a little impatient with me)  Doing.

Me:  I guess I don’t understand.  What do you mean “doing?”

Joseph:  I mean it.

Me:  (a little exasperated) What do you mean?

Joseph:  I mean it.