i don't know anything

a conversation i had yesterday...
person: where's liz?
me: i don't know.
person: is she in her apartment?
me: i don't know.
person: why did you buy artichokes at the grocery store?
me: i don't know.
person: how do you cook them?
me: i don't know.
person: where's that fella of yours?
me: i don't know.
person: how are things going with him?
me: i don't know.
person: how was "american idol"?
me: i don't know.
person: you don't know very much.
me: ...i know.