Possible Clues:

• ''Change the subject''
• 'Let's just not talk about it because you would never understand my feelings'
• Research for one that is not worth explaining
• I'm not prepared to talk about academic work
• ''It's a secret!''
• *Resolving a Mafia dispute, e.g.?
• Response to 'How bad was it?'
• 'Let's not go there'
• 'It was bad, and that's all I'll say right now'
• Terse response to 'Rough day?'