There was an additional twist: After four or five verses, when you sense your subjects mental defences have been suitably weakened, suddenly switch to:

"You're on top of a tall building... AND YOU FALL OFF!!"

This line was accompanied by a violent forward shove. If, as was hoped, the victim's imagination had momentarily gotten the better of them, this sudden image would induce, at least a two-second show of shrieking and thrashing about on the ground, and, at best, a lifelong struggle with depression and psychosis.