"Breaking the fourth wall" refers to a situation in which a character reveals his or her awareness of the audience (this can also be called metatheatre). The technique has been used for millennia: it was standard practice in Greek comedy. For instance, at one point in the Greek playwright Aristophanes' play Peace, the hero Trygaeus (who is being lifted into the air by a crane situated offstage) tells the crane-handler to be more careful.