could have fooled me

(You) could have fooled me.

Inf. I would have thought otherwise.; I would have thought the opposite. Henry: Did you know that this land is among the most productive in the entire state? Jane: You could have fooled me. It looks quite barren. John: I really do like Mary. Andy: Could have fooled me. You treat her rather badly sometimes.
See also: could, fool, have
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