Final answer:
August and Jack Will laugh hysterically at the end of the chapter due to the absurd and unexpected events that have taken place.
Step-by-step explanation:
At the end of the chapter, August and Jack Will laugh hysterically because of the ridiculous and unexpected situations that have unfolded in the previous passages. The laughter acts as a release of tension and a way for the characters to cope with the absurdity of the events. It also serves as a form of catharsis for the readers, allowing them to find humor in the otherwise serious and intense storyline.