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Phrase(s): Fancy that! [and] Imagine that!
I am very surprised to hear that.; That is hard to imagine or believe. • Mary: My father was elected president of the board. Sally: Fancy that! • Sue: This computer is ten times faster than the one we had before. Jane: Imagine that! Is it easy to operate? Sue: Of course not.
McGrawhill's American Idioms And Phrasal Verbs