Possible Clues:

• Informally ditto, that's what I think too
• Concurring comment
• Informally ditto, I think as you do
• 'I agree'
• Echoic words
• ... whose uncle gets pardon before me too
• Ditto - that's what I think too
• ''I agree!''
• 'That's what I think too'
• Me too