During a rehearsal of Puccini's Tosca one day, Maria Jeritza slipped and fell on her way to the sofa from which she was supposed to sing "Vissi d'arte." As she was not injured, she simply began to sing from her prone position on the stage. "At last!" Puccini exclaimed. "That's how it is to be sung! Tosca struggles with Scarpia, falls to the ground and from there addresses her aria not to the tyrant but to Heaven."
[Puccini later remarked with amusement that one of his best dramatic ideas had stemmed from an accident.]