Yes, this is the scene where the Dark Knight Returns

.... but that wasn't a cinder block wall.

And that was several pages of montage like villain beatings
where you never actually see Batman.
Until the full page of the Dark Knight with a very disturbing smile.

And the next scene we would see the psycho
analyst on TV saying that Slap-Chop was just a lonely boy who needed a mother's loving.
... the knife? He was going to cook a meal for her to show how much he cares.