Possible Clues:

• "Much appreciated!"
• Reaction that can be grateful or sarcastic
• Words of gratitude often used sarcastically
• "Some help you are"
• "Very helpful!," ironically or not
• 'That was really helpful,' sarcastically
• 'Great job you did for me,' sarcastically or not
• Real or faux expression of gratitude
• "Real helpful, jerk!"
• . . . in Milwaukee