What is the comic element in chapter 6?

Harris tells his friends about the time he attempted the hedge maze at Hampton Court. The map, given out in advance, seemed quite simple, so that Harris was confident he could easily best the maze. His confidence attracted a mob of 20 people who were lost in the maze, and they turned on him when he realized the maze was more complicated than he thought it was. They wandered for a long time, until a young groundskeeper came to fetch them, and got lost himself. An older groundskeeper eventually guided them out.