Possible Clues:

• 'I didn't expect that'
• Indie band Uh ___ Her
• "Say that again?"
• Goes with John Mellencamp's "Uh"
• 'That's strange'
• 'Say that again?'
• “I didn’t expect that!”
• 'Wha'd ya say?'
• 'You talkin' to me?'
• Word from one who isn't following