Possible Clues:

• 'You're better off not knowing'
• 'I'd rather not talk about it'
• "Let's not talk about that"
• Response to 'Rough day?'
• "It's not worth getting into"
• ''I'd rather not discuss it''
• Exasperated response to 'How was your day?'
• 'Rough day?' response
• Response to "Was it that bad?"
• "You're better off not knowing"