could have fooled me
idiom
—used to say that something seems very surprising or doubtful based on one's own observations
"He's an expert in his field." "Well, you sure could have fooled me!"
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“Could have fooled me.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/could%20have%20fooled%20me. Accessed 24 Apr. 2024.
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