There are two main forms; the first is the sarcastic echo, the second is the dark reprise. This trope is favoured by the writers of musicals. The sarcastic echo is a duet, but one party is oblivious to this fact. The main singer opens with a happy, even sappy verse. But there is an onlooking character mocking the first from the wings. Compare Dual-Meaning Chorus, more common in country music, where a song's chorus is interpreted differently with each iteration (and the song only plays once). Examples of Dark Reprise include: