Looping is a technique used by writers to create intrigue, build anticipation or strengthen a theme. It is typically done by referring back to a point that was made previously.
The secret is to leave the loop open by changing the subject without disrupting the flow of the narrative. A basic loop will do this by telling the audience what is about to happen: ‘we’ll come back to this point in a bit.’ However, the most powerful loops use a subject change as a distraction and then close the loop by later referring back to the original point. Audience satisfied, point emphasised, job done.
Here is an example of how Milton Jones uses looping for comedic effect. Comedians are of course, the masters of public speaking.