GUILDENSTERN: I think I have it. A man talking sense to himself
is no madder than a man talking nonsense not to himself.
ROSENCRANTZ: Or just as mad.
GUIL: Or just as mad.
ROS: And he does both.
GUIL: So there you are.
ROS: Stark raving sane.
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead