Once 'Round The Goldfish Bowl
A description of how poor someone's short term memory really is by drawing similarities to a goldfish.
Girl: Hey! What did I say a minute ago about which items I wanted to order?
Guy: Jeez. Someone's been once 'round the goldfish bowl! It was that new book you saw.
Guy: Jeez. Someone's been once 'round the goldfish bowl! It was that new book you saw.