Letra de
Brain damage

La canción es parte del álbum The Dark Side of the Moon, lanzado en 1973. Aborda temas como la locura y la presión social. Según Roger Waters, la canción fue inspirada por su observación de que las personas tienden a ocultar su locura para encajar en la sociedad.

The lunatic is on the grass.
The lunatic is on the grass.
Remembering games and daisy chains and laughs.
Got to keep the loonies on the path.
The lunatic is in the hall.
The lunatics are in my hall.
The paper holds their folded faces to the floor
And every day the paper boy brings more.

And if the dam breaks open many years too soon
And if there is no room upon the hill
And if your head explodes with dark forebodings too
I'll see you on the dark side of the moon.

The lunatic is in my head. (laughter)
The lunatic is in my head
You raise the blade, you make the change
You re-arrange me 'till I'm sane.
You lock the door
And throw away the key
There's someone in my head but it's not me.

And if the cloud bursts, thunder in your ear
You shout and no one seems to hear.
And if the band you're in starts playing different tunes
I'll see you on the dark side of the moon.