what do you know!

(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

(Well) what do you know!

something that you say when you are surprised by a piece of information
Usage notes: This phrase is often used humorously to mean the opposite.
And they're getting married? Well, what do you know! (humorous) Well, what do you know! The Raiders lost again.
See also: what