My favorite musical cliche crosses over from movies to the stage.
The entire reason for the plot/show is "miscommunication" between the characters.
Examples:
I thought you meant, I misunderstood the message/cablegram/card, I heard from Nancy that you said such and such so I assumed, and so on.
The entire plot is based about the miscommunication issue and if the characters had just talked to each other, there would be no "reason" for the problem.
"My dreams, watching me said, one to the other...this life has let us down."