Examples:

• It's obvious we have to go back to the drawing board.
• Back to the drawing board with that, please, Mercedes.
• We decided to go back to the drawing board, and build Geoff II.
• Back to the drawing board with that, please, Mercedes.
• Right, and with that, back to the drawing board.
• I suggest you go back to the drawing board.
• All right. I guess it's back to the drawing board.
• No, I prefer "back to the drawing board."
• Right, and with that, back to the drawing board.
• But you must go back to the drawing board.