Also, "Where Have All the Children Gone?" is the earliest example of this. The accompaniment isn't music, it's actually a spoken-word routine, which makes it all the creepier. All the girls are wearing the exact same dress, Vivi-Anne pushes Mackenzie on a creepy swing, and if it wasn't scary enough, the girls start disappearing one by one with subtle hints as to what happened to them. For example, Nia clutches her throat as if being suffocated, Paige jumps off the stage, Chloe clutches her chest as if she was stabbed, and so on.
The "sequel" to this routine is "I See the Kite Flying". In this one, each girl is a mental patient, rocking back and forth or hitting themselves in the head. The same monotone returns for this one, making it just as eerie.