Possible Clues:

• 'I'd rather not talk about it'
• 'You're better off not knowing'
• "Let's not talk about that"
• Response to 'Rough day?'
• 'Let's not talk about it'
• Exasperated response to 'How was your day?'
• 'Rough day?' response
• Response to "Was it that bad?"
• "You're better off not knowing"
• Answer that avoids answering