Possible Clues:

• "Just doing my job"
• Humble reply to 'Nice job!'
• 1999 Macy Gray hit
• "That's my goal"
• 'Just doing my thing'
• Possible response to "Good job!"
• Humblebrag, of a sort
• Humble self-appraisal
• Coy response to a compliment
• Humble reply to "Great work!"