hark who's talking

hark who's talking

or

look who's talking

People say Hark who's talking! or Look who's talking! to mean that something critical that someone has just said about someone else is true of them too. Hark who's talking! If you were so honest, we wouldn't be in this mess. `They're all mad.' `Look who's talking, you crazy old bat!'
See also: hark, talk