While working on his Lego robots, one piece was not working exactly how Thomas had envisioned it working, so, with a heavy sigh he took it apart and said “Oh well, thanks for the cardboard.”
Me: The cardboard?
Thomas: Mum, thats just a saying you say when you have to start something again from the beginning. Thanks for the cardboard.
Me: Do you mean back to the drawing board?
Thomas: Oh. Yeah. That one maybe.