Nothing to do with Z's...

A little girl walks into a pet shop and asks in the sweetest

little lisp, "Excuthe me, mithter, do you have wittle wabbits?"

So the shopkeeper gets down on his knees, so that he's on her level, and asks, "Do you want a wittle white wabby or a soft and fuwwy bwack wabby or maybe one like that cute wittle bwown wabby over there?"

She in turn puts her hands on her knees, leans forward and says in a quiet voice: "I don't fink my pyfon really gives a thit.