(one) (has) never heard (of) such a thing

(one) (has) never heard (of) such a thing

One finds the thing mentioned absurd, mystifying, amazing, or very hard to believe. The dealership wants to take the car back from us and give us a different one? Why, I never heard such a thing! The committee has reviewed your application and, frankly, we've never heard of such a thing as you are proposing.
See also: hear, never, such, thing
Farlex Dictionary of Idioms.

(I) never heard of such a thing!

an expression of amazement and disbelief. (Compare this with Well, I never!) Bill: The company sent out a representative the same day I called to examine the new sofa and see what the problem was with the wobbly leg. Jane: I've never heard of such a thing! That's very unusual. Bill: The tax office is now open on Sunday! Sue: Never heard of such a thing!
See also: hear, never, of, such
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • never heard of such a thing!
  • toady
  • if frogs had wheels, they wouldn't bump their butts
  • if frogs had wings, they wouldn't bump their butts (when they hop)
  • cockamamie
  • fact is stranger than fiction
  • truth is stranger than fiction
  • don't that beat the Dutch!
  • a dog and pony show