The Praise Team has unwittingly become like the third grade jokester who invites you to have a seat, pointing to a chair. When you go to sit down, the jokester pulls the chair away, and you land on your backside. The Praise Team does the same thing musically; the congregation never knows (indeed, it can never know) how the Team will perform each stanza until the congregation hears it.
HT: Paul Schlueter