Related Clues:

• 'That's odd ... '
• 'I've gotta think ...'
• Sound of contemplation
• "I'm thinking"
• 'I'm thinking'
• Sound from a ponderer
• "Interesting"
• "Wait, it'll come to me in a second" sound
• “I wonder...”
• What you might say after reading a tricky crossword clue
• 'I dunno ...'
• Consideration exclamation
• Utterance while chewing on a pencil
• 'I wonder what it could be ...'
• ''Now, that cookie was sitting right here a minute ago''