(WELL,) WHAT DO YOU KNOW!

Inf. a way of expressing surprise at finding something that is unexpected; an expression of mild surprise at something someone has said. (No answer is expected or desired.) •

Andy: Well, what do you know! Here's a brand new shirt in this old trunk. Bob: I wonder how it got there.

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Tom: These two things fit together like this. John: Well, what do you know!