a noise...

ESTRAGON: In the meantime let us try and converse calmly, since we are incapable of keeping silent.

VLADIMIR: You're right, we're inexhaustible.

ESTRAGON: It's so we won't think.

VLADIMIR: We have that excuse.

ESTRAGON: It's so we won't hear.

VLADIMIR: We have our reasons.

ESTRAGON: All the dead voices.

VLADIMIR: They make a noise like wings.

'Waiting for Godot" - Samuel Beckett