Why, why, why?!

Just about anything you say to Joe these days is met with "Why?"  Julie decided to turn the table on him last weekend and jotted his responses down on the napkin she was using as a bookmark in the book she'd been trying to read:

Julie: Joe, why are you four?
Joe: Because I am and because I had a birthday.

Julie: Why will you turn five next year?
Joe: Because I'm going to be in kindergarten.

Julie: Why is the grass green?
Joe: Because it needs grass seed.
Julie: Why?
Joe: Because it needs to be.

Here is where Julie stopped, but you see, of course, how it can all go on indefinitely, though it would appear that the use of circular logic might offer an escape hatch from the madness, if one's conversational partner isn't familiar with the charge, or isn't willing to level it.