Possible Clues:

• 'Be reasonable, will you!'
• Bad sign cutting into beef, don't be upset
• Don't be upset
• 'Let's get real here ...'
• Be reasonable to bully getting round warning
• "You can't be serious"
• 'Don't be absurd!'
• Be reasonable!
• 'You've gotta be joking ...'
• 'You must be joking ...'