Possible Clues:

• Knew the answer
• Taken all one is willing to
• Ruined, beyond hope
• Reached the breaking point
• ''I've __!'' (''Enough!'')
• Hit upon the solution
• Possessed item that is ruined
• 'I've --!' (exasperated cry)
• Took enough guff
• It's more than enough so to strike around Father up here