Related Clues:

• 'Wait, what?'
• 'Say it again?'
• "That's odd"
• ''You said what now?''
• “Well, that’s a surprise!”
• 'Wait, what did you say?'
• “I didn’t expect that!”
• Come again, though only occasionally
• “Say what?”
• ''Beg pardon?'' but way less formal
• "What the?"
• "Uhh ... wha?"