what do you know!
(well) what do you know
A phrase used to indicate one's surprise. Well, what do you know—we have chocolate chips in the cabinet after all.
(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. Tom: These two things fit together like this. John: Well, what do you know!
See also: what